The sort of facts-and-figures type of Democrat doesn't realize that politics is not the same thing as the technocratic administration of society.
Politics is not an optimization problem, it's not about finding the "optimal" state of affairs or whatever.
It's about hopes and dreams. It forms the horizon of the destiny people imagine for themselves, both individually and collectively.
It's also about virtue, morality, sacrifice, etc.
You may sneer but the masses do not.
This is why Democrats lose. They have no vision. What they offer right now is the same boring, stagnant, soul-less status quo, guided along by accurate reasoning about facts and figures.