Why are Dems so obsessed with black people even though Latinos are way more numerous and will completely replace Black Americans.?

They want to take advantage of another race's struggle in order to get media coverage and funding for their campaigns. I'm pretty most of them care more about the money that they are receiving from clueless people donating to the BLM movement than actual black people.

We're not, silly person.  Republicans are.

Blacks first, then Latino 

because Black people do crazy stuff like riot and steal and burn down buildings and cars, etc

You're obsessed with what "Dem's" are supposedly obsessed with.