I think a couple of these points are getting mixed together.

On the “crimes aren’t prosecuted” issue: that’s a broader criminal justice question, not really an immigration one. Whether someone is a citizen, documented immigrant, or undocumented immigrant, the question of prosecution policy is the same. If people think prosecutors are being too lenient, that’s something to take up locally through elections, town halls, etc. Immigration status doesn’t really change that dynamic.

On sanctuary policies or limits on local cooperation with immigration enforcement: the argument many cities make isn’t “ignore crime,” it’s “local police should focus on crime.” When local law enforcement is seen as an arm of immigration enforcement, it can discourage victims or witnesses from reporting crimes at all. So the policy goal is usually public safety, not shielding criminal behavior.

And on the last point: I agree. if an undocumented immigrant commits a crime, sure, there can be both a criminal justice component and an immigration component. But it helps to be clear about what problem we’re actually trying to solve. If the concern is crime, then that’s primarily a policing and prosecution issue regardless of who commits it. If the concern is immigration system design, then we should look at whether data actually shows disproportionate criminality among immigrants before framing it as an immigration enforcement failure.