Well, they were wrong. They bought into a false reality.
You are right the best and brightest rarely teach at community college. But, when taking your generals, there is not much of a drop off overall. Seriously, do you need to pay top dollar for general courses? Of course not.
I'm not saying they 'have to' go to our worst schools. I'm saying they have other more cost effective options that offer as good of education for undergrad. I've known kids that legitimately were the brightest, but they made poor choices. An example is a kid that got a full ride to Vandy which is a pretty good school, but ended up going to Stanford with little financial assistance because 'it was their dream school'. The brightest kids make these choices everyday, looking at the shiny object versus what makes the best financial sense and parents go along with it because 'its their dream'.
You say that they chose the most expensive school because they thought it would give them the best job. I call b.s. They chose the expensive school over a variety of capable options because it was their dream school and got tunnel vision. That poor choice is choosing luxury vs. practicality. I was one of those kids that looking back paid for that 'luxury' when I could have went to similar colleges nearby for half the price and had some good sizable loans as a result.