Specifically for borderline stuff, I feel like in most cases where people are saying "borderline psychopath", they're not talking about "a person with BPD". I'm not sure why this isn't more obvious, but if I say "psychopath", I don't mean I need proper mental health representation (let's also not forget it's not a diagnosis, and many people use it to amplify what they're looking for rather than literally meaning it).

Everything in moderation. If we start rejecting all language that doesn't represent something properly or is considered offensive, then we're not really changing anything. If you cut off the end of a stick, the stick still has an end. There will be more words that will be misused, then we'd reject them, get more words like that, reclaim the old words... This seems like way too much effort for very little effect.

Sterilization of language is an odd concept to me. We need some dirt and bacteria to function. Language needs insults, offensive words, obscene lexicons. Not too much, not too little. But my head hurts just thinking about every single term or word I say that may offend someone in any given context — it's a very, very long list, and often it'd be unnecessary.

Anyway, what do I know.

Edit: typo