That's not how it works. If local cops show up, they only assist ICE. The NYPD in this photo were Brad Lander's (Elected official being kidnapped) entourage. When ICE turned on him, they held the press back from ICE and then the senior member of their group cooperated with ICE and left the building alongside them and Lander. No asking for ID, no asking for a warrant from them, zero resistance, only assistance.

If the Dems want to actually exercise their right to resist a kidnapping they should be showing up with private security, or exercising their own 2A rights (Something that pretty much only politicians and friends of cops can do in NYC because NYPD gets constitutionally-questionable veto power on gun permits). But I'm guessing that is exactly what the Trump regime is waiting for. They will send in the national guard once that happens.