I don't think that's a practical way to deal with protests of any kind. It's a good way to fire them up, if that's what you want to do.
Demanding that police are excluded from the parade is more than a protest though.
Tell me, are black people less safe or more safe if there are cops around? They feel they are less safe. Sometimes they are, but I'd bet it's actually quite the opposite.
Activists protested enough that they were able to remove police from schools in Toronto. The data showed that the cops actually made the students more safe, but sometimes people care more about how they feel rather than the data.
Cops do bad things sometimes, they also need to be given credit where credit's due. They easily one of the toughest jobs.