“Trump said that very specifically in the case of untrained, mentally ill people who own guns....”
But who determines if they are mentally ill? A competent medical expert must make such a determination, and then the court must rule that the evidence of that expert is persuasive enough to warrant depriving that person of his personal property. That is due process.
I think 44 times reported to authorities, plus the poor kid calling him self and begging for help would be enough reason.
The alternative to some mechanism of removing guns from that kind of situation fast is the school shooting. Is that acceptable?