Because you have to be smart enough to evaluate your own talent. Our GM's evidently are not that smart.
Drafting Alex was a stupid move BUT, there are 2 other facts that I think are much more telling. Alex was the only REAL attempt to get a Franchise QB. Why did they not draft more QB's high since 2002? STUPID. Also, you have to be capable of identifying what you have in a QB quicker than 4 years. 2-3 years tops, if it still looks bad, cut him and draft another.
We don't have a Franchise QB because ownership-management does not make enough high investment acquisitions at that position. Even Garcia was not a high draft choice.
So basically we only made 1 pick all decade long, and we spent that 1 pick on the worst possible person