Do you support laws to prevent people with mental illness from purchasing guns?

One of the problems is that doctors say they can't always identify which mentally ill person will become violent. You could pass a law saying that anyone who seeks therapy or medication for mental illness cannot own a gun, but what if they already own a gun before they seek treatment? Are you going to confiscate the weapons they already own? What if a soldier returning from war or a hunter feels like he has a mental illness? He might avoid getting treatment because he doesn't want to give up his gun(s). You might say that choosing one's guns over one's mental health is irrational, but what are we talking about here? That's right----mental illness!