Megadeth singer Dave Mustaine is an idiot ... because Barack Obama is not to blame for the Aurora massacre ... so says one of the people who was shot in the theater that night.
TMZ spoke with Carli Richards ... who sustained multiple gunshot wounds when James Holmes opened fire during a screening of "Dark Knight Rises" last month.
After watching the footage of Mustaine blaming Obama for "staging" the Aurora shooting to push an anti-gun agenda, Richards is lashing back ... telling us, "Some people think the President is a good scapegoat but he didn't shoot me."
Richards adds, "It’s obviously kind of absurd and people who make up conspiracies just want attention."
"Everybody is emotional at this time and needs to blame somebody I guess. I don’t think they realize the consequences of not being responsible for your own actions and James Holmes needs to be held accountable for his, to whatever way the justice system deems fit."