The biggest problem with fandom right now is that many of us tend to interpret characters as necessarily equivalent to real people, and their relationships with each other as analogs to how real-world relationships do/should work.

We judge the actions of characters based on our interpretation of real-world morality and ethics, often overlooking that many characters in a work of fiction are symbolic actors, whose actions and relationships are tied to the story's themes.

These themes are often grounded in some manner of real-world material value, but it's limiting to our understanding of fiction and art to assume that sympathetic depiction is equivalent to endorsement.

Before I majored in Psychology I majored in Lit Studies so now I'm making that everyone else's problem too

The example on everyone's mind right now is Catradora. While a lot of us are, rightfully, celebrating the ending of She-Ra and the culmination of Catra and Adora's relationship, there are, as always, a contingent of viewers insisting that Catradora is toxic and abusive.

And like, alright, taken completely at face value, a romantic relationship between two individuals who have definitely tried to kill each other in the past is not likely to end well.
But that's an incredibly narrow view of the symbolism of the characters and their relationship.

Now, like most long-form fiction, She-Ra has many themes being communicated throughout the work, so keep in mind that what I'm about to say is merely exploring ONE symbolic facet and interpretation. It is neither definitive nor complete.

Adora represents ambition through means of altruism and self-sacrifice. Catra represents ambition through means of pragmatism and competition. The quality of "ambition" is shared, but the means through which each expresses that quality are inherently at odds.

Our culture views the former as more "moral", itself represented in the story's framing of Adora as the protagonist and Catra as the antagonist. However, one theme of the story is that neither is wholly correct.

Adora constantly putting everyone else's needs before her own results in her misery, and may lead to her undoing. Likewise, Catra constantly stepping on everybody on her way to the top leaves her alone, miserable, and ultimately without allies when they're most needed.

Adora needs to learn to be a little self-serving, that she may also partake in the joy she strives to bring to others. Catra needs to learn to forgive and trust in her allies, that she may have people to rely on when she needs them.

Thus, their romantic relationship is symbolic of a compromise between these two expressions of "ambition". It is not meant to communicate to the viewer "It's totally cool if your romantic partner threw you off a cliff, several times".

To stress, there's a LOT more to it than that, but getting hung up on "it's toxic because they fought violently" limits your scope of what they and their relationship represent.