Your not wrong.I would quibble with that. Hela wanted to regain her throne in Asgard which she felt was rightfully hers. And her big beef was with her father Odin, who had raised her to be a conqueror by his side then just tossed her aside. Part of her whole thing is that Odin is a huge hypocrite and a shitty father, which are pretty undeniable.
Of course this gets into the whole thing where we're defending fictional mass murderers.
But she also just wanted to keep going while Odin wanted to stop.
She also killed everyone who tried to stop her and was sad and confused they were not accepting her as Asgard's Queen.
She I literally a monster that only another could stop by destroying the entire realm.