Of course Scrooge was hated by the Left: He was a middle class single business owner who employed locally rather than outsource to China.

Scrooge's trauma is just that: trauma. He has PTSD over Christmas. Everything bad happens then. His breakup. The deaths. His father. The dude has legit mental illness, and because it IS legit mental illness, the left hates him for it. And it takes three spirits to basically shock therapy him back into normalcy: Past identifies his problems and makes him acknowledge those problems. Present identifies his current lifestyle and his pathos, and alternatives he can take to his current lifestyle choices. And Future explains how it leads to a negative space. That's... Just alcoholism counseling.

EDIT: A major plot point in the movie is Scrooge doubting the ghost of his business partner, because he worries of food poisoning. "There is more gravy than grave to you, good sir.". Scrooge doesn't have the money to buy properly preserved and safe food, he's immediately fully expecting potato blight hallucinations because of his buying habits. Look at ANY rich person... Even the ones who "totally live like normal people" ain't buying moldy potatoes to save a few cents.