Same reason people use aimbots in counterstrike. Same reason people use aimbots in this game. Feeling superior to others even though its the computer playing the game for you.
People hack the shit out of this game and don't get caught. Makes me feel even better when I top the scoreboard without any pussy ass hacks and also intoxicaed.
As much as ive seen haxxorscums in real life, they dont really care. Had quite a few wallhack/aimboat friends who just randomly played it for the lolz of it. They didnt care if they got banned or anything. They just went for the cheatingway cause it was only just a game for them.
If you do deal with hackers that do really furiously care about the game they are cheating in MP, than I assure you, you are dealing with some damn sad individuals. The normal lads are the "You banned me for hacking? No big deal, I know what I was dealing with" types. The irl wierdos are the ones who start sobbing and begging for mercy, when they where clearly the ones screwing the pooch. Frankly I dont want to be in a same community with those wierdos. They have a way of throwing childish tantrums whenever they get displeased.