In all likelihood we wouldn't have gotten into or through the industrial revolution (hell, probably even the renaissance) without people performing many of the loan and financing functions modern day "bankers" fulfill. The current possibilities for space exploration likely wouldn't exist.

I know it's fun to hate on bankers these days, and that there are some good high profile examples of things going wrong, but try to keep some perspective. Just because you can paint everyone with some brush doesn't mean it's actually a good idea.