> it's also opening the ol' Overton window to a range of possibilities beyond the usual vague but well-funded "reform". If that's what it takes to get a marketplace of ideas, I'd say it's productive.

Slogans like #ACAB and "defund the police" shut down debate on reform. They're most successful at consolidating the pro-police position with moderates by presenting the entire police-reform spectrum as anti-cop radicals.