If your argument is we need to address mental health, I'm not going to argue with you there. But guess which party in the US is described by all four of these bullet points:
gutted our mental health infrastructure
Consistently votes down legislation to fund investment in mental health infrastructure
Consistently opposes any measures to implement Red Flag laws or other attempts to make it harder to own guns
Consistently deflects to mental health being the problem whenever we have more people die
While they are refusing to budge on either of the two middle bullet points, people are just dying.
So I have little sympathy for folks who defend guns with the premise that mental health is the real problem. Fine, let's say it is, doesn't matter because you are preventing us as a nation from addressing either of those issues.