I'm definitely in agreement with you regarding deceased individuals, however the modern take is to apply our current standards to behaviors of long deceased individuals in order to negate their accomplishments.The difference is that Mussorgsky and Ravel are both deceased. Whatever they might have been, they aren't doing it anymore, and attending a performance of Pictures at an Exhibition won't line their pockets with silver. Whatever they might have been is irrelevant to Mussorgsky's composition and Ravel's arrangement.
OTOH, when you a company does things you consider objectionable, and you know that doing business with them will give them a bit more money to do these things with, it becomes a different situation.