This is due to the lack of land for them to develop the knowledge they have acquired during their education. It could be because they are wrong in choosing the right field of study that makes it difficult for them to develop their skills. If they go to college according to their talents, surely they will know what to do after they finish college. In this case, I can say that they went to college just to join in.
~snip
Just to give an example, in my nation we have a lot of teachers, which means teachers get paid less than what they are worth since they are replaceable and many teachers are out of a job, and government tries to put them in local places but can't employ them all, so there are way too many teachers who are either working for a little amount of money, or not working at all.
Means depending on the need. That's what I can understand from the example you gave.
In choosing an education, it is also necessary to look at good opportunities. If in our country there are already too many educators or teachers, then don't choose that field anymore to be able to take on a role to apply skills. In the country where I was born and raised, apart from teachers, there are a lot of health workers.