For all the anger and disillusionment situations like this can cause it
seems clear that you still have an underlying belief in these kids-good
and bad- that you can acheive something with and for them.
Hang in there! Some of them have yet to realize how lucky they are.
One other thought- maybe you could print out some of your postings and
pleas for help along with the responses and share them with the class.
Ask them to write their own responses.