Yes, I had a similar experience, my parents was amazed as it looked real time movie - the graphics were so nice and real and they had the same question.
Firstly all other games apart from Hitman (Call of Duty, Assassin Creed, Splinter Cell and almost all the games in the world) does require killing, guns etc.
What is unique about Hitman is
- Agent 47 kills only the bad guys, that’s why your score reduces if there is a non-target kill even if its is the bad guy’s henchman.
- Sometimes due to politics and money, many bad guys escape with their wrong doings - for them agent 47 is required - I feel he is an underrated super hero who makes the world a better place.
With Hitman, you learn a lot of patience and not just kill around with guns.
Lets see how IOI’s 007 James Bond games comes up.