This still is not how you do things.
For starters, if they are terrorists, then they should be locked up in our jails, not deported where they can continue to plan attacks.
But before we do that, shouldn't we have a trial? You know, the whole "innocent until proven guilty" thing? How do we know, for example, that this isn't just a case of mistaken identity? Or a zealous ICE agent? Heck, how do we know that this isn't some agent getting back at his girlfriend?
That's why we have courts and trials.
When you are welcomed at someone's house, you don't start going around by lecturing them on how to run their house.
They are free to support Hamas, just not in the US as students.
But ok, then let's say they said or wrote wrong words. How do we know that actually happened? Trust ICE? How do we know they were on Visas? How do we know ICE didn't abduct the wrong people?
You haven't gotten around the problem of no due process.