Do Catholics have an ulterior motive in accepting evolution?

I don't believe in Biblical literalism, but I would be hesitant to label creation stories as "a piece of crap". There are very important reasons that humans make use of mythology. In my opinion, reading myth as literal fact strips it of it deeper meaning and value. I was raised in Catholic schools, and we didn't have any other "motive" for learning the theory of evolution other than that it was more scientifically plausible than Young-Earth Creationism.