Right now there is a loneliness epidemic throughout the world. More and more people aren't entering relationships. Gen Z men are having significant trouble dating while there are some economic factors in the mix. From my own view and experiences combined with what I've read most Gen Z men are lack the social and communication skills to even enter a relationship. This has and in the future will lead to extreme issues. There's already been a marked rise in hostility towards women by young men (think Andrew Tate and his ilk) that's likely born out of this frustration. I would definitely say there's been a rise in gender hostility ever since the pandemic.
Back in the 50s there was arranged marriages. All a person had to do was just show but now that's gone because it was an unequal system and I think society missed its chance to establish something much healthier and better in its wake. Now we have people that are unable to connect with each other. We just toss people blindly into the mess that is human interaction and relationships and no one knows what to do anymore. We could be have the most fulfilling relationships humans have ever had. Think of the amount of people who would of never have entered abusive relationships had there been someone around them that showed them what love exactly is.
The way we teach is so heavily focused on teaching people how to be worker drones that we forget the human part of the person. This is why a lot of people who do extreme well in school and college fare so poorly in relationships and have higher rates of depression. We are the most educated and advanced in human history, we know psychology, we can teach this shit rather than tossing people blindly into the meat grinder.
Hurt people hurt people, as they say - and that cuts both ways. Yes, you should be kind and supportive if you can, but you aren't obliged to put yourself at risk in order to do so.
Malignant narcissists cause significant, ongoing harm to those they get their hooks into. They may have a terribly sad backstory and lead unpleasant lives, but that doesn't help the victims any.
BPD abusers tend to be less evil-karen on the surface, but their need for ongong validation is just as intense, and they will harm people just as ruthlessly in order to maintain their supply.
I don't think it's unreasonable to point out some red flags to let people steer clear of that risk.