Ahh, but you weren't talking about "people" were you? You were talking about women. How women bail on marriage because blah blah blah. How women have false expectations. How women didn't think they'd have to sacrifice to make a marriage work.
And you're wrong about that last one. You're slightly right about the false expectations. Women typically go into marriage expecting there to be good days and bad, that it will be work, and sometimes it will be very hard. They're assured from most sources that in the end it will be worth it. They narrative is that you will be a team and work together to raise a family.
So, the false expectation is that you won't be the only one making the sacrifices. This is where reality comes and kicks women in the teeth. Because that's not what a lot of women get. They get something else.
Back in the day, it was "you made your bed ..." so suicide and depression rates for women were high.
Now, some get out and try again. Some settle in for the long haul and divorce as soon as the kids have fledged, though making it that long usually requires some kind of chemical sustenance to make it through the day or self medication via alcohol. Some just get tired and ride it out hoping he dies as soon as possible so they can have a decade or so of living a happy life.
One thing is clear. The rising numbers of women who either never marry or never remarry show that women do not believe marriage is the best life they could have, either from direct experience or observation.