This is just my humble opinion.
United States was turning a blind eye on those who crossed the border illegally for a long time. I am surprised an illegal alien could register for, and be paying taxes - should that person not be arrested, jailed and deported the moment he/she shows up to register?
There are many people (including from the countries where illegal migration is happening) that went through the legal processes to get to the same. Maybe they have green cards, maybe they are US citizens - but they went through all the hell of getting there the right way.
How would these people feel seeing that others who ignored all of that, took an illegal shortcut, but end up with the same rights? It is utterly unfair to those who follow the laws, who follow the rules, who bent themselves backwards to please the government officials to get there.
US should be, and that's not from the moment Trump got elected, be actively searching, fining, jailing and deporting any illegals who have either illegally entered the country or have overstayed their permission of stay or are violating the conditions on their visas/entry documents. And the same should be done by every other country on this Planet.
The only part of this that I disagree with is when someone criticizes the government, the visa is revoked without their knowledge and then arrested and deported, like what was happening with students arrested by ICE. United States is the land of the free, of the free speech, the freedom of opinion, and that should allow for peaceful expression of opposition, especially when it has nothing to do with the government itself, talking about another country (Israel/Palestine in this case). But at least if someone cancels your visa, and turns you from legal to illegal, the minimum should be that you get informed of it and given short time to appeal or pack up and leave.
Can you imagine Thailand decided that because of something you wrote on this forum, your visa is revoked, you are now in Thailand illegally, which you have no idea of as you weren't informed, police grabs you off the street, takes all your belongings and sends you to IDC at the airport awaiting deportation? That is a police state that you would not expect United States to become.