This!
The mental illness issue needs to be handled delicately which is something I believe our law makers collectively are incapable of doing. Even under the best circumstances with unbiased mental health professionals making objective evaluations of whether someone is fit for firearms ownership the process can in cases be very subjective. People will always slip through. Law makers would use the "nuclear option" to stop anyone even remotely associated with having any kind of illness "just to be sure" because its "for the children." With the way the antis are, the mental health angle will be used not to determine if someone is fit for firearms ownership, but rather for determining if there is anything in this persons history that could be used to strip them of their right to bear arms.
If the antis had it there way I think we would see the following:
Have you ever seen a psychologist? Right denied
Have you ever seen a psychiatrist? Right denied
Have you ever taken an anti-depressant or other mood altering medication? Right denied
Do you feel the need to protect yourself? You are paranoid and must be mentally ill, right denied
That's about right. Blanket judgements that will screw half of the population.
Let the witch hunt begin.