This situation reminds me of seeing some POS beating the crap out of his GF on the street. You walk over to help and the get the girl out of there. The guy gets tough as they always do.....I mean they showed their old lady who is boss so why not you too.

About that time you knock the tough guy on his butt what happens.....the crazy B still bleeding from her nose, jumps on your back, pulling your hair and clawing the crap out of your face all the while screaming what a POS you are and to leave him alone.

Moral of the story......mind your own f-ing business. Nothing good comes from getting into other peoples crap as you will be the bad guy in the end no matter how good your intentions are.
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Never leave a few fish for a lot of fish son.....you just might not find a lot of fish-----Theo