It's about power dynamics and it's why @TruckerBarbie 's racism vs sexism argument doesn't work.
The fact that black people are disproportionately in jail for crimes etc is a huge issue.
The fact that men are disproportionately responsible for crime/sexual assault is a huge issue.
In both cases, arguably, this continues because the people with power have created systems that continue to facilitate this. The people in power being men, mostly white men.
So, in America for example, we see black criminals being consistently treated more harshly by the criminal justice system. We see black communities consistently underserviced resulting in poorer outcomes, increased poverty and, ultimately, more crime. These are systemic issues that need to be fixed.
When it comes to male violence, the issues are also systemic. We see authorities not taking sexual crimes as seriously, we see excuses for poor male behaviour and lower expectations for men. eg let's take childcare and child support in the context of separated parents. There are few mechanisms to force a man to pay or to step up and do his share of the parenting. It is perceived as "optional". Financial abuse of women is rife and too often, unless it's so blatant and egregious, there are people saying, "but he works hard and its' his money" or whatever.
All of these are systemic problems.