There is a difference in not participating and sabotaging the battle. I thought you were going to post about the player ramming allies and keeping them out of the fight or making them get killed.
I had three guys sit in the corner and not fight because I do not sit in a corner. I only need to complete 2 a day and I might as well have fun or at least try to have fun. Having fun means driving fast, ramming Raiders, and blowing stuff up, not sitting in a corner. So, it was me versus everyone, got top score, many badges and screw those 3. They did not ruin my fun or score, so forget them and play. You only need one wave!
PS, then they blamed me for ruining the battle. I had a blast, it was not ruined for me.