[grooveless touque]

Funny that he got kicked out and the other jackasses who were shoving didn't.

In my limited experience with bouncing, I have found that this policy works like one-sided penalties in hockey...people are less likely to commit infractions if they think the refs will call against them and not the other guy. The "one or the other" policy in concerts is a way to, in addition to deterring fights, quell the situation while still allowing as many people as possible to enjoy the show. Bouncers would much rather have one person pissed off about being kicked out than all four who are involved or whatever.