Good on you, I think you definitely did right in this case. As someone who has called police on a neighbor before, and documented incidences with building management so their lease wasn’t renewed, I have found the peace and quiet very rewarding.
kudos to you. You are a real hero for helping clean up your neighborhood. 
Who will look after the disabled acquaintance?
With luck, someone who isn’t a crack-dealing parasite.
I think a grown neice is moving in with her. Also she’s separated from her husband, but they’re still friends. So she will be fine. Druggie son wasn’t much of a help anyhow.