Popman, your position begs an interesting question. Holding THEM accountable should NOT include infringement of my rights, or those of others.
How would you propose to hold them accountable? By applying an additional burden on the rest of us? Or...?
It is an interesting question, at least about the mentally ill, one I think can be answered by people being responible and aware ...
How many people who are bat sh*t crazy and own a legal gun...by lying on line F on the ATF Form 4473 and their family know but do not care...
f. Have you ever been adjudicated mentally defective (which includes having been adjudicated incompetent to manage your own affairs) or have you ever been committed to a mental institution?
These people need to contact their local authorities and ask them to look into it...
As for criminals and illegal gun ownership ...That's the $64,000 question...