I think this makes as much sense as -
Car driving games make people drive dangerously in real life.
Playing Windows Solitaire leads to a gambling addiction in casinos.
Sim City led to people becoming irresponsible city planners.
And games involving firing weapons lead to killing sprees on space stations behind Uranus.
I've played FPS (First Person Shooter) games for years - both offline against the computer, and online against other human players. To say it doesn't take intelligence to play such a game - I would say applies to any game.
To play such a game well involves careful visual observation, prediction, listening for audible cues (footsteps, falling objects, weapons reloading), team communication (spoken or otherwise), teamwork and coordination, resource management, tactics and strategy, accurate hand eye coordination, and good 3dimensional spatial skills. And all in real-time (none of this turn based rubbish). ;P
Yes, sixtyplus - a little boys domain. pew pew your dead, I shot you. No puzzles, ingenuity or plans. Even the military use such games as simulators as a type of training and to practice scenarios. A commando strike force or SWAT team locating and eliminating a terrorist force that is holding hostages. A commander taking his team of specialist soldiers into the jungle to eliminate a druglords hidden camp.
It is fine that you don't like or cannot manage such games - and cannot distinguish between the movie making death or that depicted by computer pixels and real life. But they are different to real death and killing. But just as you are welcome to your choice of game you play or tv you watch or books you read - so are others.
Seeing death in real life has never been a prerequisite to seeing death in a game, movie or book.