I really want to say that the reason these protests happen is because certain people are afraid of letting someone be heard. Third-wave and neo-feminists have a lot invested in the idea that there is an on-going, systematic, unilateral gender discrimination being levied by the straight white male protestant on every other identity. Warren Farrell's most important message, I think, is that there are real economic, non-discriminatory reasons for the gender wage gap, which contradicts virtually the entire feminist discourse on the subject (a body of work that amounts to "white men only hire white men", stated ad nauseam.)
Here's the dangerous thing, though. A few years ago University of Ottawa students protested Ann Coulter, because they didn't want hate speech on their campus. I actually supported that (successful) protest because I find the things she says to be completely immoral, racist, irresponsible, and so clearly such a cynical marketing effort to target the subliterate racists from the Confederate States of America (n.b. the protests were sparked off because she told a Muslim student at another Canadian university that he should ride a camel instead of flying).
So I guess we're both wrong?