Mental health is a squishier standard. Let's say I had depression and decided to talk to someone about it, get the help I needed to become mentally healthy again. Should that necessarily be penalized if I want to go buy a gun to go out to the range or hunting with my buddies? Should seeking help disqualify someone entirely? Does that prevent people from getting help they think they might need, stigmatizing an already stigmatized practice?

Meanwhile, if Dave down the hill has a record, he's already shown he was willing to do an illegal thing, whether or not the record is fair. If he already has reports against him for domestic disturbances, that's pretty cut and dry violent behavior that ought not be allowed to intensify.

I'm not saying mental checks aren't a good idea or aren't worth it. I'm saying that they're a harder sell because a) they take more nuance to formulate well and b) the propaganda machine will have an easier time telling people how those checks are overreach.