This seems to be a new sport. The idea seems to be to kill the other guys mower, and to keep yours still able to cut grass. People seem to want to fight with, or race, virtually anything.
Societies are fueling the taste for murdering things unfortunately. People are getting programmed (intentionally or unintentionally) to do this things. That is why it's better to avoid things that promote violence. In my opinion, you could be easily programmed without even realizing it.