Admittedly this. God doesn't care one way or the other about secular powers. In fact the first wake revival whatever you want to call it involved all the Christians becoming nomads due to persecution and scattering to the 4 corners of the earth and adapting to whatever society would tolerate them very similar to how the jews lived.Rended onto God what is god's and render onto Caesar what is Caesar's.
However, America is Unique in the sense that government authority comes from the written word and not a person or government body, and said written word does give us various rights and the right to rebel in the case of the government breaking the law of the constitution. (Though you would still have many argue that Christians are supposed to be pacifists to revolutions are still off the table for a Christian) so America is special in that regard and it's something people have taken for granted to the point of apathy.
(and yes it can be argued that the government has not been legitimate even as far back as 1865)
TL;DR There is no justification, it's just another mark in history, That being said whatever their spiritual fate is, their loss whether through death or condemnation, is our gain. much like Judas being part of the apostles or the fall of the kingdom of Israel.