why do people hack?

Because it makes the game more fun. back in the old days when jailbroken ps3s were big we used to have a right laugh, custom game modes like Zombie Land, snipers only ect. yea there were some people that used unfair aimbot and ruined it but most of the lobbys i did and found were fun lobbys everyone had a laugh. plus the devs put limitations on that are ridicules.