ICA Training: Kalvin Ritter is a target because he’s an infamous cat burglar, but does that really justify the death penalty?
Himmelstein: Like Kalvin Ritter, all 3 targets are killed for being thieves. Again, does that deserve the death penalty? Not to mention all their bodyguards, all shot for simply being bodyguards.
His backstory mentions that he had no problems killing any unfortunate security guard standing between him and his goal. The mission briefing for The Last Yardbird also showed them storming the casino with assault rifles. My impression was they they’re basically the Hitman’s universes version of the Payday gang.
As for the bodyguards: They were just at the wrong place and the wrong time as far as we know. So you’re right about that.
Bangkok: Ken Morgan is only a target because he’s a defense lawyer who successfully did his job of defending his client in court.
Didn’t he bribe people and use other illegal means to get his clients of the hook? Hardly the worst person in the game, but he’s not just a lawyer doing his job.
Hokkaido: Like Ken Morgan, Yuki Yamazaki’s greatest crime seems to be being a lawyer who’s good at her job.
Guest in Hokkaido: “Remember that janitor witness she couldn’t crack during the trial? He disappeared!”
Bodyguard in Hokkaido: “This is better than working for the mob. Remember dissolving witnesses in acid?”
The implication is that she’s not just good at her job. She also killed witnesses so that the Yakuza bosses – to which she had ties – could walk away as free men.
Whittleton Creek: Nolan Cassidy is only a target to cover up the murder of Janus. He didn’t do anything wrong except be a bodyguard.
He’s the most boring target in the trilogy. That’s reason enough to kill him. 
His backstory mentioned him working as a security advisor of a drug cartel. That’s probably bad but still on the lower end of the naught scale for a Hitman target.
New York: Athena Savalas is only a target to cover up 47 stealing the bank records that will lead him to the Providence members. Maybe she’s an unscrupulous banker, but is that worthy of being killed?
She also stole money from the bank and made it look like a robbery. But yeah, like Cassidy she’s probably one of the least evil targets of the games.
Haven Island: All 3 targets are killed simply because they’re in the way of tracking down Providence. Yeah, they run a resort that gives new identities to rich criminals. But, again, does that deserve execution?
Ljudmila and Bradley planned to betray and potential murder their partner and then erase their identities which Bradley claims will also wipe out patient records and criminal databases. Meaning a lot of innocent people are going to get caught in the crossfire if they succeed. Ljudmila also plans to betray Bradley to and make him the fall guy. Williams is probably the most innocent one and he has a tragic past: Was attacked with a knife, killed his attacker by accident and then somehow got convicted for murder. Must’ve been the same judge as the one from Con Air.
Berlin: 47 kills up to 11 ICA agents simply to send a message. What’s their crime? Doing the same things as our hero protagonist, but just less skilled at them?
47 is hardly what I would call a good person. Killing people for money is bad. So they aren’t innocent people.
Chongqing: Hush and Royce are only targets because 47 and Olivia want access to the ICA data core. Like the Haven Island targets, these 2 are only targets because they’re in the way.
While Royce seems to be nothing more than a bad boss ala Athena Savalas, Hush is far far worse. Previously holding a high-ranking position in a dictatorship? Check! Using his skill to help criminals like organ harvesters? Check! Trying to murder Olivia – his apprentice – when she discovered the truth? Check! Conducting experiments on homeless people that erases their memories and then throws them back out into the streets as broken shells? Check! Trying to developed a way to mind control people for the ICA? Check!
He’s just getting killed because he’s in the way. But he’s still a very, very, very horrible person. Probably one of the worst targets in the trilogy.
The Icon: As far as I can tell, Dino Bosco committed absolutely no crimes, whatsoever. He’s a target solely for being an egotistical actor costing his studio money. He may be the most innocent target ever executed in-game by 47 over the past 20 years.
Klaas Teller and Rick Henderson would like to have a word with you.
But yeah, he’s probably the most innocent target and the only one not committing any crimes.
A Silver Tongue & A Bitter Bill: Two targets who are executed for… running a multilevel marketing scheme?
They are con men. Trying to sell tape water claiming it can cure cancer. Probably the most realistic targets in the franchise. I don’t know many drug dealers or terrorist. But I’ve heard of deadly sick people who lost a lot of money because some “doctor” sold them a miracle cure.They are preying on peoples fear to get rich.
Snow Festival: Dmitri Fedorov is a target for the crime of negligence and skimping on safety standards. He’s on par with the Swing King from Blood Money in this regard.
You can also add horrible, inhuman working conditions to the list. People like him are modern slave owners.
Sergei Larin. Art forgery is deserving of death?
Anthony L. Troutt. A right-leaning populist congressman who’s executed basically for pissing off the deep state.
Gary Busey. Similar to Dino Bosco, he’s committed the greatest crime of all: costing a movie studio money.
Gabriel Santos. Executed for being an extremely demanding celebrity chef? In real life, that’d be the equivalent of murdering Gordon Ramsay.
Wen Ts’ai. Executed for writing mean things on the Internet?
Pavel Frydel & Akane Akenawa. Executed because a medical malpractice lawsuit would be too cumbersome?
Kieran Hudson. Targeted for being an annoying celebrity paparazzo.
Overall ETs seem to be less evil that most regular targets, often only committing relatively minor crimes.
The congressman, however, did open fire one his own men during a war. Probably not the reason why he has to die, but it makes him less likeable .