maybe not... although it would be hard to prove whether or not the bike was left out with the intent to injure a would be criminal... it's not like you did anything particular to your bike to make it any more dangerous than you would normally ride it.

that'd make an interesting court case... im sure that you could prove that you know how to handle and operate it... and given that it's your property, its not like anyone else should be riding it without your consent anyway.

buyer (or thief) beware.