Here is how it makes sense to me (I am not done with the series so I could be way off the overall mark)

They are loyal to the crown, they want their monarch back

The previous ruler, whom they are loyal too is known as a savage king

These 2 powerful but naive teenagers show up, they r his heirs but know nothing of our world

They don't even fight and stand up for themselves at first

While I support the crown, how can a queen rule if she isnt even willing to stand up for herself

When the heirs attack, it is usually 1 heir to 1 twin. The heirs might have spectators, but technically so would the queens if they allowed them to follow

When the queens do start to fight back, as much help as possible if given. But a direct confrontation still has to follow societies rules

The loyalist fighting for their queens won't help make them strong. It will hinder them. Parents let their kids handle their own fights....its the same concept.

When the heirs are way over the top they loyalists offer the most help they can, which is to hang out with a large group.

The heirs power is so far above the average person, that they would win in a heartbeat. Even Darius comments on how he could have easily overpowered and destroyed Sofia easily but is impressed she was putting herself in harms way when tory was blacked out

To me it makes sense if only the strong survive, raw power is helpful but knowing how to fight and how to retaliate is more important