Aye, I'm sorry you're having neighbor issues.
Mine is the same, but opposite. I'm 22 and my husband is 23 and our neighbors crap keeps ending up in our yard, they've torn the yard up, and they are loud, obnoxious and annoying. I can't see their house from my house exactly. They're in their late forties.
The "security brush" issue would have irked me the most. I like my privacy, too. So if somebody cut it all down. Man.
Have you talked to them to see if they were aware they cut down all the trees on YOUR property?