Random crits during hunger games or cell wars is just really unfair, imagine this, you are winning a fight against a random person, then, they get a random crit. All of a sudden, you either die instantly or the match becomes even. Its not fair that someone could win a game by just getting lucky instead of being skilled. Guards getting 100% crits is more fair than random crits because you know that guards get 100% crits so you have to plan more carefully, but random crits you cant always plan ahead of that.