I can't vouch for all the courses, but I've been to the LIFE course twice (once on my own, and once to accompany the GF) and I thought they more than covered the full breadth of topics and subject matter. A person coming to the class knowing absolutely nothing about guns, will leave with a healthy understanding of the basics of firearm ownership. But like any knowledge or skillset, unless practiced and applied regularly it depreciates. Moreover, unless the person is willing to apply what they learned, it doesn't mean a damn thing. More training will not fix stupid, irresponsible, or lazy.
I look at firearm permits like drivers licenses. Yes there are idiot drivers out there, just as there are idiot firearm owners out there. The vast majority of drivers and shooters are good decent folk, and you barely even notice them. It's when those idiots mess up, that's when everyone starts paying attention. BUT to say the government needs to step in and implement more rules and regulations just to handle a few stupid people is ridiculous.
Part of the risk of a public range, is it is open to the public-- shooters of all skillsets and mindsets. If you don't feel safe, don't shoot there.