"We do not do civil detention arrests," Police Chief Paul Saucier said at the time, reassuring them that they wouldn’t be party to the ICE assault Trump was about to unleash. The police, he said, "do not have the authority to affect a civil arrest."
What he didn't say is that if you try to stop the civil arrest, the police will stop you from stopping it.
That is, then, actually doing civil detention arrests by proxy which is functionally the same thing as doing the arrests.
If two people rob a gas station and somehow the clerk dies because a box fell on their head during the robbery ... those robbers go down as murderers now.
How is that type of logic not applicable here ?