Sorry this is long.
I don't know AnotherMe2015, I'm new. I said it probably applies to her here too (more than it applies to you for all I know), it's a human trait being stubborn/defensive. I was supporting/complimenting on a couple specific things. I'll admit I should have worded it so it didn't sound like the point was attacking other people.
If she really says her affairs are virtuous, this is taking it too far unless she really does it to help other people (and doesn't enjoy all the hot secret sex, seems unlikely). But I don't see why adulterers being more/less moral is absurd? Extreme example....a woman living in a country with little-no protection for women with abusive SO's, a woman can't divorce, can't leave her husband w/o being in danger. She has an affair with a nice guy.
Other extreme. You hate a guy for a dumb reason, start an affair with his wife, secretly record the sex, use the footage to ruin the marriage. Much less likely than the other example but the point is putting boundaries on a spectrum. These two affairs don't have equal morality. If you accept that then you accept there might be other levels/forms of affair morality.
Back to u/AnotherMe2015. Sounds like she tries not to split other relationships, even tells AP's not to leave their SO's. Compare to people who go into relationships/marriages specifically to "steal" one SO, succeed, then leave their AP. Nothing but wrecked relationships in their wake, I knew a guy who did this 3 times I know of. 1 of those times the couple had a daughter. When you see this slash/burn affair style compared to something like AnotherMe's, just having 1 "morality level" for adulterers isn't enough anymore.
Anyway. Sorry for the finger pointing, it wasn't very even handed of me.