I'm with you. Slogans like "abolish the police/cia/fbi" seem like crank politics in the current context, but consider that until about a hundred years ago "votes for women" was seen as crank politics in much of the world. You have to introduce radical ideas to people, and you have to understand that it will take some time for those ideas to catch on - but eventually you reach a tipping point where so many people are saying it that it's not a radical idea anymore.

Libs who complain about the slogans of radicals are just trying to be tactful in saying that they don't support that goal. "Oh of course I don't like it when innocent people are gunned down by government death squads, but I don't want to get rid of the death squads entirely!"