shlishi, Based on your comments in the H&M thread, I have no way of answering you.
If you wanted a response based on New York law, you’ve already indicated you don’t follow the law inasmuch as you condone the commission of the crime of Criminal Mischief as long as the perpetrators are not caught. So the law is out.
On the other hand, if it is a question regarding Halacha, you apparently believe that one can destroy the property of another without asking a rav for his approval beforehand and that one need not even ask a rav for his opinion afterwards. So Halacha is out.
Then which is it, law, Halacha or some other standard of “ethics” or “morality?”