I was afraid someone would suggest something like this. What is meant anyways by this deliberate vagueness when using the term "mental ilness"
Is an otherwise sane person with post traumatic stress disorder the same as someone with antisocial personality disorder or with paranoid schizophrenia? "Mental illness", so to speak, results or is affected by an endless diversity of natural and circumstantial factors, along with personal decisions, so it is ignorant to assume that all psychological disorders take the same course and have the same behavioral manifestations.
Innumerable murderers and sadists would never be suspected of having any problems and demonizing people with depression, affective disorders, anxiety disorders, ocd, social disabilities, adhd, people suffering from psychotic or dissociative disorders, etc., would only take attention away from dangerous people who look successful and functional, perhaps deliberately. Collectively speaking, humanity, not just the small portion of "mentally ill" people (all of which this dishonest person portrays as dangerous when most of them are not), is an abject failure. If only mentally unstable people committed violence, then there would be little need for guns, or the control of weapons and explosives, or a government, or a military. If individuals never massacred children, or engaged in terrorism, or became mass murderers and dictators, then there would be no neccessity for supposedly "good" people controlling guns and nuclear weapons. There is no documented positive or negative correlation between disabilities/psychological disorders and ethics. Views about the control of weapons aside, this disingenuous person is trying to displace responsibility for increased antisocial violence from sociopaths, consisting of both "normal" and insane people (who most likely, more often than not, are obsessed with assault weapons along with the senseless violence portrayed by the "entertainment" industry on tv and other media), to a population that so many appalling people get away with abusing.