You know when the Russian's were losing to the German invasion in WW2, they decided that the best way to defeat the enemy was to burn the entire land of food and back in and wait for them to starve during the winter. This way, they figured that if they could not keep the land, they were not going to give it away to the enemy at it's peak of quality. So they slashed and burned, thus the term that is applied when some people leave message boards. Rather then just humbling themselves and saying thanks for the time we had, they make sure to burn a little of what good remains. Thinking this will defeat what they perceive to be the enemy in their own mind and leave with their own little form of slashing and burning.
Don't know why I brought that up, just seemed to come to me.