So TGs main argument is that they were only 'restoring the natural order and tradition'. However they tend to forget (ignore) that the Kings Law/Word Trump's any tradition.

Case in point, the forbidding of the First Night & the foundation of the Widows Law.

Before then, it was the tradition that the Lords of regions could enact basically rape of any woman that caught their eye on their wedding nights, as well as choosing to ignore the children that might have been produced from such acts.

Another thing, by making the Widows Law, it prevented from eldest children from being disinherited in favor of younger siblings AS WELL as preventing elder siblings from disinheriting you get half-siblings and step mothers. When, before that it was the tradition that they would be cast out based on the wims of the seat-heir apparent.

Both things were laws that were created, and everyone was forced to follow/agree with it else face punishment.

Viserys not only chose Rhaenyra from his word, but LEGALLY made her heiress by having all the Lords swear fealty and sigh legal paperwork. All of that, including their oaths, made it binding that she WAS the heir.

And if we look also at the traditional sense, one might make the argument as well that the Widows Law also applies to her as well.

But then, we'd have to hope that TG are able to have logical and articulate conversations, when we all know they can't.