> Personality disorders aren't curable.

Incorrect. There is no single cure for personality disorders, but that doesn't mean they can't be cured. Any mental illness that is not genetic and which develops due to external causes can be cured. There are many personality disorders, of which NPD is one. While there is no single cure for NPD, in fact NPD can be cured in many cases in one of two ways. Some can be cured relatively quickly with an antidepressant, which eliminates the symptoms, but most with NPD can either mitigate the disorder or completely cure it though talk therapy generally in under two years. It's absolutely true that one can learn to stop being an asshole.

Both you and parent are likely incorrect. The truth is, curability depends on a number of things which we currently lack the correct insight and models to correctly analyze. It's likely case-by-case, and ad-hoc, based on the extremely complex history of the individual.

But most importantly, we don't know, so making broad, absolutist claims is a waste of time.

Personality disorders can be treated and managed, but not cured. Like PTSD, just because a disorder is caused by external factors does not mean that it is reversible.

Magic mushrooms can cure PTSD

I think treat is probably a better term to use until we have better data.

Psychedelics could be an interesting line of study for personality disorder treatment as well.

Dude, come on. That statement needs several strong caveats.

It is not untrue but it is incomplete. It may make things worse. But it could cure. A cure is possible.

> There is not single cure for personality disorders (/) NPD (…)

I presume this is because the classification of these disorders is way to broad and unspecific as opposed to hard science diagnostics.

> (…) through talk therapy generally under two years

Would you have a good source for that e.g. a meta study?