Nah, if you effect other people's property, you are morally responsible for the foreseeable outcomes. You don't get to absolve yourself of responsibility because you've decided that their preparedness didn't meet your expectations.
I should also apologize. I was over-aggressive in my response. Just ticks me off to see a comment that seems like it's defending messing with property of others (which you actually didn't imply, but instead I inferred it).
