Now explain to me why OBL was living but a few kilometers down the road from the Pakistan military's intelligence school, in a culture where everyone knows every one's business.
The “not very deep thinkers” you refer to frequently have degrees in things like nuclear engineering.
That said there are some not as bright as others.
The purpose of a AL raid is to capture the target, not to blow him away, and to get in and out without anyone knowing or finding helicopter parts strewn about, so McRaven’s raid apparently didn’t go as planned.