People who steal or mess with other peoples' stuff make me want to puke. I'm a mild-mannered guy, but if I caught somebody going after my stuff, I would be more than willing to wind up in jail if I got arrested for beating their ass. It just unfuriates me. But, they're always cowardly enough to do it when they know you're not going to be around, like 2 in the morning in your case.
I live in a small town and as recently as, say, six years ago, I would have left my KLR sitting on the sidewalk in front of my house all night with the keys in it without worrying about somebody taking it or kicking it over.
Not any more, though. Even here, those days are gone. I used to leave it sitting down back outside my basement door, but I noted, on a couple of occasions, passing vehicles (usually kids) slowing down to eyeball it. So, now, I roll it inside when I get home.