@givemersspls We're not
supposed to forgive her; sympathy/pity do not equal forgiveness. They're not mutually inclusive.
For instance, I pity her, because
nobody should have to go through what she did. The dialogue and scenes heavily imply that, in addition to being a sex slave so thoroughly "trained" that responds even when her mind is absent, she was passed around to people who had a penchant for cutting up their fucktoys, which leads me to wonder just how often she was literally torn apart only to be stitched back together again for her next "customer"?
Nobody is coming out of that sane. Especially since there's no real mention of just how long it actually lasted, but seems to have been years.
And I
understand her reasoning, to a degree. After being made a slave, her entire existence was nothing but pain and suffering, which she believed was partly her atonement for what she did to Junpei, as her monologue stated; she then believes that his torments are even greater than hers and that, like her, he would welcome the release of death, so she sets out to "save" him by ending his suffering. A mercy kill, basically.
I also, again to a degree,
understand her killing that dude who rescued her, because he was one of the guys she went off with, so she believes he's culpable in her suffering; she's not exactly wrong, since the gang was apparently still together when what's-his-face got "bored" of her and sold her off. Oh, sure, he was "worried" about her ever since then, but he didn't actually object, so it wouldn't be much of a stretch to say he's just as guilty as what's-his-face for her situation.
And again, I also
understand her going after what's-his-face's wife and kids. She went through (likely) years of hell because of him and she's supposed to forget it all because he's "changed" and has a family now? Why should he get to live a carefree, fulfilling life when he's the source of basically all of this series' suffering? But torturing just him wouldn't be enough to fully impart the suffering he's caused, so she goes after his family first.
We're
supposed to understand why she did those things: she's a broken mess that believes killing Junpei will free him from his suffering. But we're
not supposed to forgive her, because understandable or not, what she's done is monstrous and deserves death in its turn.
As for imagining if she were male, we really don't have to, considering Kaifuku Jutsushi no Yarinaoshi is a thing; same with Nidome no Yuusha, which has a similar premise. Most of the comments can be boiled down to "cringe", "edgelord", or complaints about the MC just being a savage dick who's not worth the ink he's written on (more or less). There's also, to a degree, Shield Hero, but that one's never gotten the kind of flak the others have because the betrayal happened on screen instead of through flashbacks, though you still get tons of comments about how stupid Naofumi was for letting Bitch live.
EDIT: Sorry for the long post; I didn't realize how long it actually was until I hit submit.