I couldn't imagine that people would be so intent on winning that they'd try to completely ruin the other teams' scores by trying to make their score negative. Anyways, as our mentor Mr. Stokely pointed out, in overall points, if you won the match by them getting negative points, your overall score would go down because of the whole thing about you getting your score + 2x their score or whatever.
To be totally honest, I'd be kind of disappointed in a team that attempted that.
