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I watched Sailor Moon a long time ago, so I don't remember the plot very well, but I think Tuxedo was their ally, not their enemy, or am I mistaken?

We need a maniac, and Tuxedo is the perfect candidate. According to the plot, he initially acted on his own, and the Sailor Guardians didn't trust him, and he didn't trust them. Well, except for Sailor Moon, with whom he had a romantic relationship. Later, when they found out about him, he became a full-fledged ally, but at the beginning of the first season of the anime, he was more of a loner, albeit not as aggressive as in the game setting.