Those who want serious police reform are in a pickle. They have to persuade other progressives and simple phrases like "Defund the Police" and "Abolish the Police" are useful for that purpose, but they lack the nuance that these plans involve. They are uniformly negative and don't include the positive aspects of providing alternate solutions to social problems.
As a result, they are easily abused by the conservatives. Abolish the Police sounds utterly insane, much more insane than the actual plans that involve a different form of law enforcement combined with significant social programs. Trump has an easy attack here. Focus on the slogan, not the plan. The slogan sounds asinine by itself.