I suspect it’s less against the interests of what Feminism is ostensibly supposed to be, and more against the interests of Feminism as it actually is.

MRAs are in some senses an offshoot of Feminism, made possible not by Patriarchal power, but by Feminism’s flaws.  If you have a bunch of men around questioning dogma and demanding that principles such as innocent-until-proven-guilty are upheld, well that isn’t so great for changing the standards of evidence on campuses, now is it?