There is the imminent threat of mass death, and no one here is under any illusions about it.
Every ICE agent is armed, and most have ready access to automatic weapons. These are not well-trained members of an elite organization with a storied, patriotic culture. ICE is a personalist paramilitary organization, and the president has indicated that these ICE agents are immune from consequences, even if they kill people. These are people who volunteered knowing they were going to go into American cities and do violence to people they perceive as their political enemies.
Most of these agents are inexperienced, jittery, poorly trained new recruits away from home. They aren't locals. Their nexus of power and governance isn't local. These are not our community members, they aren't from here, they don't know us or care about us, so they do not empathize with us.
In addition to this, the American citizenry is shockingly well armed. Because everyone involved is so well armed, everybody is slightly touchy about this descending into rioting, because there is a very short path from light rioting to what would essentially amount to civil war. The costs of such any such violence will overwhelmingly be borne by the innocent people who live here, and we know it.
So, people are trying to strike a balance of making sure these people know they aren't welcome here while trying to prevent the situation from spiraling into one in which some terrified agent mag-dumps a crowd of protestors and causes a chain reaction that results in truly catastrophic mass death.
Wish us luck, we're trying.