My sympathies. Makes you wonder what all that is supposed to accomplish
Probably just a bunch of idiot teens who don't know better. They are probably trying to be offensive and don't realize that there is offensive and there is
offensive (offensive is cussing someone out or insulting them, using the symbols of a group that murdered 6million of us just for being is something altogether different). Of course, it could be more sinister and be some group that is newly active and wants people to know they are here (so I am being even more vigilant about having my HD weapons ready, just in case).
The neighborhood where most of this has happened (and all neighborhoods where this has happened so far) is a place where the starting price of a pretty average single family home is over $500K. This is one of the 5 richest counties in America. So, I do lean towards assuming the first likely cause/goal (rich and upper middle class areas breed a lot of bored teens). However, the county is also very ethnically diverse so you can't rule out the second cause/goal as this would be an area they'd likely enjoy messing with.
Isn't your screen name a Hebrew word? Are you Jewish?
It is a Hebrew word meaning "life", it is also a fairly common Jewish name. It is part of my Hebrew name (I am Chaim Dov). I am an Orthodox Jew.