The Sith, while some being utterly corrupt, consists of the most open-minded characters and not all with terrible intentions. Take Darth Maul for example He tried EVERYTHING to warn Ahsoka that Palpatine was planning something that could eradicate everybody which, as we know, came to fruition.
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His plan was to lure in Anakin and kill him but Ahsoka denied him and then she denied him I think two more times after that only for her to realize that he was right the entire time. Maul, while a tyrant, could have saved the Jedi order.