First, a possible explanation/reconciliation of The Dark Side of the Force:
First, we must note that the Dark Side has multiple 'groups/schools/styles' under its banner. Most of the Dark Side practitioners (like the Witches) are of the exploration of The Force variety, just using the Dark Side as the methodology of said exploration. These practitioners simply study and utilize the Dark Side in a sort of 'mad science/magic' sort of way, as long as you don't do shit like, oh, completely break the cycle of life and death.
Second, the most dangerous aspect of the Dark Side is not the passion but
negative emotions with said passion. Passion gives you a moderate power boost to force abilities in general but negative emotions even more so. Both in combination is
extremely dangerous as it is powerful for it makes the force user act like a druggie looking for his next fix. Sidious is powerful (and dangerous) not because he is a master practitioner of the Dark Side (he's probably in the top five list in terms of practical ability) but because he is able to stay
sane despite being, effectively, on
extremely copious amounts of Force!Hard Drugs.
What The Force wanted is to
completely and utterly annihilate the Banite Sith and basically UNPERSON their entire existence. Period. Why? They broke some
seriously high-level 'rules' and what results from these rules being broken is why the
Blade of Mortis is still around. Sidious and his predecessors broke those rules and would break even more to ensure that they would win against the Jedi.
Yeah... have fun with that implication.
Ok, fanfic idea time:
Basically, Grogu becomes a Jedi Master but in his timeline, Sidious's return turns the galaxy into a complete and utter clusterfuck, and with the help of Ezra and The Force, Grogu gets transported back into the days of the Old Republic and the Jedi Order - in body and soul I might add.
What Grogu doesn't know is that The Force wants him to finally kill Sidious
once and for all. Grogu simply wants to prevent the fall of the Jedi Order and the Old Republic... leading to interesting butterflies (maybe even have Grogu be Anakin's Master
).