> Is there any other decision with such long lasting consequences?

As a young adult? Let's see...

Drinking and driving, unprotected premarital sex, drug use and abuse...there are plenty. These are all decisions that a 17 or 18 year old has to make very regularly and the wrong decision can be very harmful.

To your point though, the decision around this massive student loan racket is the only one I can think of that was / is actively encouraged by so many parents and educators. Like I said, there's plenty of blame to go around. But that doesn't absolve the 17 or 18 year old of blame.