NeverarGreat is bringing up some great points. I think the very fact that so many people (at least that I have talked to) thought that Rose crashing into Finn made no sense proves this. Because they felt (as well as I) that the movie set them up for Finn making a successful sacrifice.
That’s just how they interpreted the scene, as well as how I did. Doesn’t make it more right than an alternate interpretation, but that is kind of how movies work. They are meant to provoke different opinions from people and readings of the same material.
The Last Jedi in my opinion, for that scene, presented it in a manner that set us up to be angry and puzzled with Rose’s decision. Just my reading of the scene.
I think most disagreements over TLJ originate from people presenting their interpretations of certain scenes as the only valid—and therefore obvious—interpretations, with any interpretations running counter to theirs being completely wrongheaded.
I’m not trying to say every scene has only one proper interpretation, but rather that your preconceptions of how the story should go color how you interpret a scene. Knowing this is Star Wars and the heroes don’t die, Finn’s life is never at risk and there is not chance of him destroying the weapon because he has to live for the next film. That is a Star Wars Trope.
Someone seems to be conveniently forgetting The Phantom Menace.