No offense but this feels like the most un-Leia thing to do. I could maybe see it from Luke, only if Snoke tricks him into a force vision of the only solution being a common enemy or something, and Luke is desperate to not fall into the same mistake as the old Jedi. But Leia? She has always been the moral center.
She’s also been the most extremist. Without seeing what had happened over the 30 years between films, it’s possible she thought the ends justified the means. Take Mark Hamill’s example of the Hippies of old growing up to be the conservative Boomers of now. 30 years is a long time.