We do get a lot of questions that ask for why evolution did not lead to situation-X?
- Why don't mosquitoes evolve towards muting themselves?
The answer to all such questions is that there is not enough selection pressure towards situation-X, and evolution does not try to find global optimum. Should we keep repeating the same answer again and again? What do you think should be done for these questions? If you close them as a duplicate of some other question, the OP will argue that their question is about a different situation.
I think that these should be closed unless the OP asks for a specific hypothesis, but should we keep retyping the same statement for the custom close? An option is to clearly mention this rule in the tag-wiki for evolution and cite that as a close reason. What is your take?
Based on terdon's suggestion, I have created a community wiki post:
Why do some bad traits evolve, and good ones don't?
Those who are good at the subject, feel free to refine the post or add more information.