Can you stop projecting? it'll be a great things...
It's an historical fact that all royale and noble in history that tried to take the power by associating with cult or other fanatics were all killed.
There was rare moment when royale were let alive after trying to take the throne, but these people never did anything major.
A "historical fact" that "all" royals were killed. Quite the blanket statement, I suppose your confidence stems from fairytale or manga land eh?
If you want to cite history, then go and actually cite history. You have to dig unbelievably deep to find royals executed for treason, and even then, most such examples are as I said, non-European. Those who were executed often were after repeated attempts by the culprit. Others escaped execution even after multiple attempts.
The example of Edmund of Woodstock gives ample insight as to why. Edward was a Prince of England in the 14th Century who participated in not just one, but two rebellions. The first was successful, and deposed King Edward II, his half brother, in favor of his nephew Edward III (yes, that famous King Edward III, who started the Hundred Years War). The 2nd was a plot by the new regent Mortimer and the King's mother Queen Isabella to instigate Edmund to restore his brother (who he didn't know was already dead) to the throne.
The regent had him executed, but it was challenging to even find someone who would perform the execution. So ingrained was the idea that killing a royal, even if officially sanctioned, would lead to retribution either by God, by other royals or whatever powers there be, that they eventually got a
convicted murderer to do it in exchange for a pardon of his own.
Executing a royal was also seen as a challenge to the power and sanctity of the crown. It meant that members of the royal family were not untouchable, and opened up the idea that other royals could be subject to judgement by pretenders, nobility or invaders. This is why Edward II was simply sent away, despite how deeply unpopular he was among the nobility and accused of tyranny, officially retired but unofficially imprisoned, then probably murdered in secret. With no public execution.
Finally Edward III reversed the charges against his dead uncle Edmund. No accounts say he had ever been close to his uncle. Despite that, and Edmund's shattered post-humous reputation as a backstabber and plotter, Edward still reversed the charges and cleared his name, even though Edmund's treason in which he was a central figure had been a proven fact.
Edward III did have Mortimer killed, as he suspected the latter would eventually attempt to depose him too. Queen Isabella was rounded up with him as a co-conspirator against the Crown. So what happened to her? As a royal, she was imprisoned, and later even released. I hope you're seeing the re-emphasized message here.
When it comes down to it, executing royals or even nobles has to be carefully considered. A royal family's power typically comes from support of the nobles, through inter-marriage alliances and exchange of wealth, and through fear of the masses, who believe them to be some "other" who are untouchable and protected by God or the equivalent powers. Public execution sentences means the rest are no longer untouchable. That a monarch, callous enough to execute a family member, was not worthy of support by nobles who already had less status and whose protection from sanction was often also based on familial ties.
Go read some actual history, will you? Or at the very least, don't pull a statement like "all such royals were killed" out of your ass. It does not even make logical sense when one considers the context of monarchies even when absent specific historical examples.
I don't expect much, almost everything you say is based on bullshit. Like you think swords were already ceremonial during the industrial revolution. Hello? You mean like during the famous wars of that period like the Napoleonic Wars, where battles were often decided by sword armed cavalry on horseback? Or even the American Civil War, well after the Industrial Revolution had transformed mass production of gun and cannon, and yet swords were still issued for actual combat both to infantry and cavalry?
Whatever you absorbed from pop culture/internet culture is not historical fact by itself.
