Why are you in a computer

if you are talking about viruses, viruses are in computers to 1, spy on people for malicious and research purposes 2, to annoy and infuriate people 2, to manipulate and steal information 3, to make money 4(possible), to make people switch to mac and away from windows

if you are talking about games, they are to entertain and stimulate the mind also to keep bad people off the streets, the same as what porn does games are just more interactive with there customers.