Should people with demonstrated and repeated low intelligence and aptitude on empirical measurements of cognitive ability be barred from pursuing STEM?

Scientifically speaking, why shouldn't I kill myself after stopping going to class, forgetting my SO's birthday, and completely blowing off 5 tests because I got addicted to a certain Transnitrian Competitive Ox-Carting Circular and am barely more than a self-aware near-p-zombie?

When a man who got hit in the head with a literal particle beam is more capable than you, should you just end it?