Devil’s advocate here. Where is the line? In an extreme example, ADHD is a mental condition so maybe they shouldn’t have guns?
In a more nuanced example, what about the trans community? Some say it’s mental disorder, some don’t. So should they or should they not have any firearms. Highest cause of gun death is actually suicide and trans community has high rate of suicide.
The point I’m making is, I think we can agree some extreme examples are very easy to distinguish. But it is a very slippery slope where people’s rights could be taken away without proper due process. Basically, at the mercy of the current administration’s opinions rather than the actual facts of the situation.