I can answer both of those. Objectively. 1. People are terrified because the largest cities in America are being occupied. The masked men and the military are working together to pull people off the street into a horrible game of keep away. Terrified people lash out.
2. Alligator Auschwitz is alliterative, but the closer comparison is to Dachau. ICE is blocking access to Congress on a regular basis. We know they aren't designed to be hard labor camps, but I'm not seeing a lot of information on conditions inside.
Historically, we (the public) didn't know how bad the camps were until they were liberated. I can understand people not wanting to wait around this time. Especially with the masked men, gleeful laughter of collaborators, and the game of keep away played by DHS.
Of course, we shouldn't encourage mass shootings, ambushes, or any other dumb, amateur moves like that. Not because collaborators need special consideration, just because they are dumb, amateur moves.
tl;dr The staff at those camps decide to work there. They decide to block Congress when they could let them in. ICE decides to wear masks. Those are all decisions. They are optional. We can decide that isn't okay and make working there untenable and socially unacceptable.