> I don't have any better analogy than saying that's like talking about female on male rape or white people being also subject to police violence when talking about black life matters.

That second analogy isn’t what you probably want; White people are very much subject to police violence; BLM is about the lack of accountability for (not just police; the impetus was actually the Trayvon Martin killing, which was not by police) violence against black people and not about the idea that black people are uniquely the target of police violence.