Key qualifiers that Paul, via the inspiration of the Holy Spirit, included in the text.
Rom 13:3 For rulers hold no terror for those who do right, but for those who do wrong.
One could argue from verse 3 above, that rulers who do not punish only those who do wrong, are not to be considered established by God. The implication of the entire treatise is that of a ruler who is aligned with the "right" that God has revealed in the scriptures.
This disqualifies the liberals from being considered rulers.
Strange God didn't give them a heads-up as to what they should do if they had a "wrong" ruler.You'd think He'd have thought of that. Made it clear, you know? Or maybe there's a quote in there about the proper way to rebel...? Is there?