"Inconsiderate?" "Criminally negligent" would be more appropriate, I think.

On the other hand, I'm not as familiar with US law as you are.

Oh, the incident I described happened in Israel. I was not making a legal observation about the person's behavior, I was making a personal one, though, I agree, the word I used was pretty mild (the whole experience was quite horrible, I must say). And I don't have any claims to familiarity with US law... though I suspect if there were a law here that forbids unleashed dogs, there would be a lot less unleashed dogs. People here seem to be a lot more compliant with this type of thing.