Everyone remembers Rose's speech about how she wanted to put her 'fist through this whole lousy, beautiful town.' But no one ever remembers the second half of that conversation, when the codebreaker they teamed up with, DJ, reveals Rose only knew half the story.
Instead, this sequence is meant to highlight a harsh political reality that illuminates how the galaxy fell back into this cycle of conflict. The Last Jedi is a meditation on failure, and so this terrible plan is meant to be doomed.
If they had all worked together, perhaps they could've found a better way to utilize that resource. In fairness to the good-faith critics of The Last Jedi, there do seem to be more than a few better options for helping the Resistance if they have a ship capable of hyperspace travel.
