Its not about "good and moral" vs "bad and immoral", but "legal" vs "illegal". Blacklists are not currently implemented in IPFS but one imagined a solution, where people opt-in to their e.g. state-supplied blacklist to prevent run-ins with the government, which could say "if you aid criminals by providing them with illegal content, we will hold you accountable for it". In the end, it is probably nothing more than a facade to appease governments that in the end will come up with something similar ineffective.