There are multiple types of warrants. All types are "real", but they convey different authority and different requirements upon both the arrestee and the arresters.
It is both rational and legal to insist that law enforcement stay within the bounds of the authority the specific type warrant they obtained. ICE civil warrants grant different authority than every-day federal arrest warrants. That ICE is abusing that authority is no reason to capitulate to it.
It is both rational and legal to insist that law enforcement stay within the bounds of the authority the specific type warrant they obtained. ICE civil warrants grant different authority than every-day federal arrest warrants. That ICE is abusing that authority is no reason to capitulate to it.