Richard Reeves is originally from the left, and there is a podcast interview of him by Ezra Klein (titled "the boys are not alright"). In the interview he describes how he was drawn to feminism and looking at gender inequality, and by looking at the data became convinced that boys and men were a neglected cause. He was then frustrated as other researchers and policy people had no interest in that form of inequality.
This experience of a researcher starting by caring deeply about inequality, and starting with feminism, and then identifying male issues and finding a total lack of community interest has occurred before. This is exactly what happened to Warren Farrell, who a was once a major figure in feminism (and then largely ignored once he started talking about the issues facing men) (see his Wikipedia page for details).
I think part of what makes getting sociatal buy in on men's issues is that one of the biases men face is a lack of care for men in need of help, and this relates to the idea of male disposability.
For reference, there is a quite shocking list of statistics where men have significantly worse outcomes than women: longer jail for the same crime, higher rates of homelessness, higher rates of suicide, lower educational outcomes, shorter life spans, less friends on average, ...
Obviously women suffer from other issues, but as Ezra Klein is keen to emphasize to any listeners of the interview, empathy is not a zero sum game.