Ok, so you have 4 complaints:
1. They did illegal work that damaged your drain and the rabbi didn’t care.
2. They let their kids ride without helmets.
3. They let their kids play in washing machines.
4. They let their kids light fires.
Now, complaint 1 and 4 are valid, while 2 and 3 are you being a busybody. I’d like to hear the other side of the stories now.
But my advice to you is to call the fire department about the fires, and a beis din about the sewer.
And stop annoying the parents about the helmets; it won’t make you popular.