What about his 1980s work on bank runs and the Great Depression do you find so objectionable?
Second, I've always found those Great Depression/New Deal studies a little questionable when it comes to the science of economics, like I've partially hinted in another comment. It looks like the conclusion almost always aligns with the political leanings of those carrying out the study.
Sure, maybe he deserves the Nobel for an interesting work of economic history (or whatever the official term is), but I have the impression that his papers on that period were used as "inputs" for his relatively recent economic decisions, so not as a history artefact.