and having a stable past 25 for black men... educated, felonious or otherwise. That's a big part of it.
Just about all the white dudes I went to school high school with married their high school or college sweethearts. They looked at marriage as part and parcel of being successful, including the working class ones. It doesnt mean they didn't wild out before they got married but they seemed to be willing to put it down much earlier than their black male counter parts. The white dudes who where still on the prowl at our 10 year high school reunion were looked at as kinda immature by other white folks, regardless of their other successes. Not saying they had as much stigma as white women who where unmarried but their was enough there to incentivize it.
In contrast, Blacks as a whole don't look at a grown unmarried black man as a sign post of immaturity, especially if he has a job. There are a lot of things that we earmark as success like having a good job and education but marriage ain't on the list no where for men. A grown unmarried woman with everything in the world except a husband... something must be wrong with her.
You can see how these expectations lead to a mismatch in marriage priorities.
Also, kids out of wedlock has really disincentives marriage. If you're able to have kids whenever with whoever without a true commitment why bother committing?

I definitely know some black men who are grinding to get to a certain level before they marry because they want to be able to take care of their family in a certain way but most of them don't have kids.