You contradict yourself. First you rightly say the mass shooting issue is mental health.

But then you close by blaming the gun fetish for blocking rational reform. What about mental health are they blocking?

He didn't say that mass shooting is an issue of mental health.

He said that mass shootings are an issue of the combination of mental health and easy access to certain types of guns.

The practical upshot of that is that you can reduce mass shootings somewhat by improving access to mental health resources. But you can't reduce them to anywhere near the level that other countries experience, because you won't be able to eliminate mental health problems, so if people with mental health problems continue to have easy access to those certain types of guns, you will still have mass shootings that vastly exceed levels in most other nations.

Note - there is no possible framework under our current legal system that would allow you to differentially prevent people with mental health issues from easily accessing any given type of gun while still allowing other people to easily access those types of gun. You can't legally (or practically) implement a mental health diagnostic session as part of gun purchasing, and nearly all mental health diagnosis and treatment (save for those with judicial intervention) is confidential and not reportable. Nor would such prohibitions likely meet the new SCOTUS test for firearms regulation.