We see people all the time that we stay away from because of their behavior, language, or attitude. We recognize and can readily admit that there is something with the person we just can't put our finger at it. Deviant behaviors are always recognized to late by counselors and parents. Once something devastating happens then everyone speaks out about how the person always seemed a bit weird. They walk amongst us and no amount of political correctness should stop us from speaking and reaching out to identify those that are a danger to themselves or others. 

The Bully Proof Classroom

They Walk Amongst Us - Article