It's not easy, and shouldn't be given how many rights are involved (we are essentially talking about incarcerating someone and infringing on other fundamental rights), but it can work if anyone cares to at least start the process.

One thing to keep in mind, it's easy to think about this case in isolation, but any loosening of the procedure opens it up to abuse by an authoritarian government. 

Not to go too "tin foil" but it is intellectually inconsistent (and more than a bit hypocritical) to worry about any given administration, like the current one, being an extrajudicial threat to the civil rights of their opponents, then hand them the power to arbitrarily declare people "insane," without legal recourse, and incarcerate them just because you have a problem with one single such right.

Again not going Godwin nor Stalin-ing, but we have real, fairly recent experience with that sort of thing. If people truly fear the current admin they can't logically make this one case an exception.