If they get political cop-outs from their pledges, then so do I.
[1] unclean: "We believe that homosexual conduct is inconsistent with the requirement in the Scout Oath that a Scout be morally straight and in the Scout Law that a Scout be clean in word and deed, and that homosexuals do not provide a desirable role model for Scouts.” https://www.law.cornell.edu/supct/html/99-699.ZO.html
[2] rapists: E.g., http://www.huffingtonpost.com/entry/gordon-klingenschmitt-bo...
[3] To their credit, BSA has since modernized its policy and, hopefully, this remains a minority voice. But still, a large and vocal minority IME.
I don't think anyone has a problem with the former. But yes, the latter is... worthy of criticism, especially from engineers and scientists who pay attention to things like empirical counter-examples. Maybe not bigoted, but also clearly false.
I guess you don't know many engineers, or you only know software engineers in Silicon Valley or something. Engineers, in my experience, and especially the non-software kind, tend to be extremely religious. In fact, studies have found that many middle eastern terrorists come from engineering backgrounds. The engineers I've worked with have been overwhelmingly conservative, and frequently religious. (Those that weren't conservative were usually libertarian.)
Yeah, your typical Millennial programmer in the Bay Area probably isn't religious at all, but hang around some 40+ mechanical or electrical engineers and you'll see an entirely different crowd, with probably a lot of Trump supporters.