I am an advocate for men's rights for many of the reasons you cite, but I also acknowledge that there really are people who adopt the MRA label who are bitterly misogynist nutjobs who have no interest in a more just and equal society, but are rather the flip-side of those misandric feminists who believe--amongst other things--that "rape is nothing less than a conscious conspiracy by all men against all women" (likely not an exact quote as it's from memory, but Brownmiller says something with the same meaning.)
The problem is that misogynist MRAs disrupt the possibility of positive change the same way misandric feminists like Brownmiller and McKinnon do. Because they share a label with sane people, they allow the enemies of sanity to mount a trivially plausible ad hominem against any proposal to genuinely address the real injustices that men and women face due to the simple fact of being a man or a woman.
The problem is that misogynist MRAs disrupt the possibility of positive change the same way misandric feminists like Brownmiller and McKinnon do. Because they share a label with sane people, they allow the enemies of sanity to mount a trivially plausible ad hominem against any proposal to genuinely address the real injustices that men and women face due to the simple fact of being a man or a woman.