I imagine it's part of the same playbook as "sex I regret after the fact is rape." It's something I see sometimes when an adult woman ends up in a relationship she regrets. Saying "I made a poor decision" would imply some level of fault (and saying "I was attracted to his money/looks/ten-incher" is obviously right out.) Even saying "I was manipulated/tricked/lied to" isn't enough for them, since it implies ignorance, it implies that someone more aware or savvy could've avoided the situation. That's why you get nonsense like thirty-somethings being accused of "grooming" a woman in her twenties. Grooming children/teens for relationships/sex is objectively disgusting (despite what discord trannys might tell you,) so if a woman- even one well into adulthood- says "I was groomed," it instantly conveys the idea that they were completely innocent in the situation and that the other party was fully to blame and is objectively evil, and has the bonus of getting them tons of attention and asspats from their hugbox.
Why they don't see this as infantlizing and embarrassing, I don't know. I guess some people are just that averse to accountability lol