ah.. that dreaded question...
i get asked all the time. >.< usually, my response is something to the extent of "NO. We do not maliciously destroy 6 weeks of hard work, but if that happens while we are trying to achieve the objective of The Game...."

i'm kidding about that last part. But really, i explain that the entire Purpose of FIRST is not to hate your opponent to the point of wishing to destroy all of their hard work and labor, but unfalteringly help them in every single aspect of the FIRST robotics competition, whether it has to do with the robot or not. then i briefly explain the layers of competition and such, ask them if their interested, and if they are, get excited because surely if they at least know what Battle Bots is then they may have hope to spawn a love for creating robots, not just destroying them.
