What type of people other than known abusers and cheaters would you not let date your best friends or close family?

Not let is figurative in this sense, just means you would have a talk with them, and say that's not a great idea to be with them for whatever reason. It can be based on the first impression of person, or from knowing them already.

What type of people other than known abusers and cheaters would you not let date your best friends or close family?
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