I've seen instances where people start defending themselves, security comes by, and arrests the defender for whatever reason (not always because shitcurity.), and tosses them in for the ten fucking minutes when the attacker wasn't even hit that hard.
At the very least, having minor assault would lessen the times on these instances.
That, and people tend to be less pissed when the sentence is smaller. Even if they were a massive shit and punched some idiot for next to no reason, they're a LOT less likely to come get revenge on security/ other crew if they get four minutes, instead of a ten minute sentence. Not always, but it does help.