Hey John,
Thanks for reminding me about those, as I remember such one in my life too. The best thing we can do about them is to either change them in the core, or cutting all the connections to them and leaving them alone. I did the second for that person, mainly because I wasn't the person I am right now and he was quite disturbing to me. He still is not the type of person I'd like to hang out with.
With love,
TheSingular
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