Unaddressed, of course, is why anyone would be carrying a gun in a diaper bag... It's just too bad it didn't happen before the moron had a baby--too late for natural selection to cull the stupid from the herd before breeding.
The gun industry preys on the weak minded and convinces them they need to have guns to protect their families. The sad truth is obvious from this article. Don't blame the dad. Blame the manufacturer and the politicians working for the gun industry. This is a tragedy that could have been avoided with responsible leadership.