That's true. But the problem is that this particular failing goes essentially all the way to the top. There was a massive pressure to get people with Manning's

That's true. But the problem is that this particular failing goes essentially all the way to the top. There was a massive pressure to get people with Manning's skills into the military jobs that required clearances. This was such that even the process of getting a clearance got oursourced to contractors (witness the furor around the company that handled Snowden's screening). Even if Manning's immediate supervisor had tried to get him stripped of his clearance for any of the many "red flags", his supervisor would simply have got in trouble instead for doing something to get rid of a warm body in a seat that needed filled.