How did the phrase/idiom
for crying out loud come about? I don't understand what is "for" doing here. For X means that X is a requirement that has to be fulfilled.
Why don't you do it *for X* means
You should do it in order to fulfill condition X. In that sense,
crying out doesn't make sense to me. Also is that a cry like
cry in pain or
cry in anger?
I have read http://ezinearticles.com/?For-Crying-Out-Loud!-What-is-the-Origin-of-This-Strange-Expression?&id=4533931 but it doesn't answer the question.