Perhaps they should have chosen a slogan where the dictionary definition differs from the opinion of "a very very small niche".
"to stop providing money or as much money to pay for something"
https://dictionary.cambridge.org/us/dictionary/english/aboli...
"to put an end to something, such as an organization, rule, or custom"
Ayanna Pressley and Rashida Tlaib are police abolitionists. They're also quite unusual in Congress in this position.
"Defund the police" and "abolish the police" aren't the same thing. That's the point.