No, it's not. It depends on who's asking. If I see that the satoshis you're trying to give to me were part of (e.g.) a drug transaction in the past, I might not

No, it's not. It depends on who's asking. If I see that the satoshis you're trying to give to me were part of (e.g.) a drug transaction in the past, I might not feel comfortable accepting your money. The problem with Bitcoin is that I can do that taint analysis, because the entire transaction graph is public.