I feel like immigration lawyers have either been suspiciously quiet, or misleadingly loud regarding this. I don't think there is an open season on anyone maintaining lawful presence in the U.S. The cases of those of those having their status revoked or being detained involved omissions in paperwork, or engaging in behavior that has prompted action from ICE and (!) Homeland Security (!!). Hacking Law has been promoting the idea that Trump has issue with the application of the First Amendment (free speech), while completely ignoring that it is not the use of First Amendment rights that is being used to revoke visas from students or GC holders, but the choice of individuals to move from free speech and into intimidating students due to their nationality or religion, creating hostile (often violent) environments on college campuses, divulging material in support of terrorism, or having ties to terrorist organizations. Another lawyer on YouTube, Moumita Rahman, also looks at Mahmoud Khalil or Rasha Alawieh's case and implies that "it is not safe for GC holders to travel", while completely skipping over the actions that led to the revoking of his fresh GC and her H1B visa.
With many immigration lawyers there seems to be a strong anti-Trump slant informing the ideas they promote (who can blame them, the current administration has been ruthless in upholding immigration laws). The sensationalism and doomsday takes have made it harder to hear a sober one on what happens to GC holders who simply live their lives peacefully and stay true to their i-485 assurances of not endorsing questionable organizations. If you have a GC, you've signed the "Security and Related" section, you know what that means in practice. Don't lie on your paperwork, don't omit things, if you want to express racist ideas against any group within the U.S. do so, just don't turn that into an actionable crime.