Tone deaf in Silicon Valley

Why don't women enter STEM fields? Why do they leave? No one in Silicon Valley seems to be able to understand the very basic concept underpinning women's and underrepresented groups' exclusion from these fields, and until they do, they won't be able to overcome their "diversity problem."
The recent (justified) uproar around Peter Thiel's massive donation to a certain presidential candidate, and Facebook's defense of both Thiel himself and their decision not to fire him makes clear just how very