This is in their mission statement.
They say that this is the source of racism - the advantage that whites have from a father figure and a loving nuclear family is huge, and they know it. BLM doesn’t believe tha the black community is capable of a nuclear family advantage, and thus they seek to eliminate it from others lives which is very racist itself.
Further, BLM says that a non-nuclear family will make the children more open to the LGBTQ people who also support this goal in an effort to ally with another fringe Left group to gain leverage.
The BLM is actually the communist party in the US, and they want communal control of the children and their value training.
This is the world going forward if Joe Biden is elected. He said he would transform the way the presidency works and how things are done (his mental capacity does not allow for him to do the job, so he will be handing control to the radicals who are willing to ignore his own past history of racism for the promise of future power).
Understand your vote. This is not addressed to the kool aid drinkers who will undoubtedly spew their hate and denials. This is addressed to MAS in particular and others like him who might never normally vote Republican, but who are not brainwashed by the media so that they still can see what is going on. A third party vote is a wasted vote. The stakes are clear.
Link: https://thehill.com/blogs/pundits-blog/civil-rights/294451-black-lives-matter-agenda-is-about-more-than-race