They've got to correct these roadblocks on universal background checks (along with these unnecessary firearms) -- data bases prevent critical info being released. This is bi-partisan - the bump stock (after the LV horror shooting) and the 2017 Fix NICS Act. It's going to require serious change.
Sounds like both of these criminals were ready to die - this hasn't been confirmed by more than one medical expert (as far as I know) but sounds like they were both suicidal. Not that they all are. It was known the Dayton shooter needed help - mental health laws must change as well as gun laws. These corporations need more security to protect people.