He forged art, made money by selling it to literal Nazis, and blew the money on hookers and palatial houses. Are we supposed to feel sorry for the guy?
I do have complicated thoughts on the same piece of art being valued completely differently depending on if it's signed by person X or person Y, but for better or worse this is very much a thing.
Could be re-written as “via deception/trickery, deprived Nazis of monetary resources and increased the wealth of working ladies and tradespersons he associated with.”
He gave Nazis something with zero practical use in exchange for huge amounts of money. This is a bad thing?
That doesn't make taking them from Nazis bad. It would be better if he took cash from them, but again he only gave the guy a painting, he didn't help the Nazis. And better he have the paintings then a major Nazi, even as stolen property. The absolute worst option would be the Nazis selling the pile of art for cash.