Giving a Wacko a Gun Legally

How does this support YOUR Right to Bear Arms by giving a mentally ill person a gun?

Sources:
http://www.nytimes.com/2013/02/09/us/suspect-in-botched-shooting-at-ashley-hall-bought-gun-despite-mental-illness.html?_r=1&

http://www.abcnews4.com/story/21079767/mental-health-expert-background-check-system-flawed