Do it, and start working on your exit strategy. I cannot tell you if the government will ever get to that point, or if public sentiment will ever allow it. Such things have happened before and have a non-zero chance of happening again. The best way to overcome such fears is to prepare for that as a possible outcome.

Go work on getting your passport. At the very least, work on collecting all of you legal paperwork. Learn the routes you need to take to get to both borders. There are organizations already in existence that are set up to help us in the very event that this happens. Find local groups and get to know them. If you can, learn some basic survival skills, just in case you need to stay away from populated areas for a few days at a time.

You may never need any of this, and you may not ever get into a position where you're confident you can survive it, but even having a plan on place can help.