DayZ is also not "competitive" at its core (and Arma2 even has anti-cheat measures built in -> BattleEye)... this doesnt stop script kiddies from server-hopping and killing/teleporting every one (even though they have no benefit from it beside the "lulz")..
Totally different game. DayZ is about solo play until you encounter other people, and even without cheating 90% of encounters with another person are shoot first, ask questions later.
Additionally, Just Cause is about just grabbing the nearest car and gun, then going out and causing chaos. DayZ requires players to spend literally days acquiring equipment, finding vehicles, fixing them. Finding a vehicle in DayZ can be a super rare find. In Just Cause 2, cars are everywhere.
Basically, cheating is a problem in DayZ because of the extreme scarcity of the resources. In Just Cause 2, there is no such scarcity. Therefore, cheating in DayZ ruins the game for everyone. Cheating in Just Cause 2 would probably go unnoticed, unless the cheater decided to become invincible.
