To be honest I think that Hatred would have been better if it wasn't just a mad man shooting a bunch of people, it could have been a story where the worlds going insane and a bunch of crazy stuff is going on. It could have taken some inspiration from Doom and Postal 2, Postal 2 actually has a bit of a cool story even though I've never played it. But yeah like planr said there's going to be a giant outrage of people going nuts over a game. Just like the joker said in the dark knight:
"look at what I did to this city with a few drums of gas and a couple of bullets. You know what I noticed? everybody panics when things go according to plan even if the plan is horrifying, if tomorrow I tell the press like a gang banger will get shot, or a truck load of soldiers will be blown up, nobody panics because that's all part of the plan. But if I say one little old man will die, well then everyone looses their minds!"
In this case the "Plan" could be a random, horrifying event that could happen tomorrow and that no one will care, but if hatred gets a lot of speculation and kids are playing it, then "Everyone will loose their minds"