To pile on, part of the conflict between liberals and those further left is that "law and order liberal" is a thing. That is, while liberals might concede that

To pile on, part of the conflict between liberals and those further left is that "law and order liberal" is a thing. That is, while liberals might concede that the justice system is flawed, there's still an underlying faith that the system will get it right the overwhelming majority of the time. The extreme radical position is that the justice system is fundamentally and irredeemably broken, and that there is no way that a conscientious leftist could work with, let alone within, a system that exists only to oppress the people and reinforce the power of the ruling elite. There's obviously a lot of gray between those two positions, but the punchline is that its very possible to be a liberal DA. e.g. Chesa Boudin's stated goals exemplify what that's supposed to look like, although without unified support from the police and the judiciary, Chesa Boudin also exemplifies what would actually happen. Experiences like that drive the broader leftist calls to defund or abolish the police. If you can't get buy in from the entire judicial system to reform itself, then just getting a leftist prosecutor elected/appointed will quickly lead to that prosecutor either being ejected from the position, or co-opted by the system they were trying to fix.