Said who? That's like picking a certain feminist or LGBTQ+ group and assuming they represent everyone and anyone who identifies as such.I thought BLM was the mouthpiece of a united black community
Black people aren't the only ones asking to defund the police either. BLM brought the conversation to the forefront but I'm not sure why you're positioning this as a uniquely black concern. Working class people, women, the disabled and LGBTQ+ people will all have their own worries and doubts over how police historically interact with them.
Also the defund movement is on a scale. Right from the complete removal of a police force, replaced by a community program, all the way to a restructuring of how they're able to apply their powers and that money being put towards social schemes.
The removal of police is something that hasn't properly or successfully been implemented, of course there'll be teething issues and people willing to return to the status quo.
Also the vote was a 56-44 split. Hardly a near unanimous decision.