I used to love playing violent video games as a teenager. There was operation wolf where you went around blasting everything to smithereens and then had to go onto an aeroplane and save a bunch of hostages. But we discovered that shooting the hostages was actually far more funny.
It was a game. Someone programmed it. It was just as funny when the lemmings in that lemming game used to fall off the cliff.
Most children make the most wild statements of death and blood and misery or maybe just kids in our family?
I've never hit anyone in my life (apart from some boys in primary school and pushing a racist girl when I was around 11 both times I was defending myself.) I still find violent slapstick funny. The scene in hangover when the naked guy jumps out and starts attacking them with a crowbar or in superbad where the fat kid gets run over but the reversing car. Both had me in stitches.
I also used to play "witches" and make potions and turn people into frogs or rodents. I was a superhero with amazing fire powers and all sorts. Games are games and unless children have learning difficulties, neglectful parents or are too young then I think it has very little influence on their adult behaviour. I wouldn't want a young kid playing grand theft auto but a teenager who I trusted and knew I wouldn't have issue with at all.
As for men being programmed into being tough and macho, if I'm honest I think for the most part the UK is very good at producing a whole range of men and women but the reality is that men have a different body chemistry to women and that makes them inherently different. Some men will like boxing and like to box. They love UFC. They want to be mixed martial arts experts. They enjoy participating and being in physical fights much more than women. Not ALL men, not ALL women but there is an element which is definitely there and definitely different.
I think the only dangers are PUSHING kids into doing gender assigned things they don't want to do or pushing them towards violence or passivity or not being there for them and not talking to them about issues of gender, violence or any other social controversies.
Nurture children, let them enjoy make believe and toys. Let them be super-heroes or sci-fi agents who have to kill to save humanity or get them game sin which they can kick people in the head with no reality or consequence if they want. So long as you spent time with them and teach them to appreciate life and to care for humanity I really think it makes no difference.