Those who are engaging on illegal activities by the use of bitcoin they are just putting themselves in danger. Bitcoin will having a negative mark regarding that once their government knows about it and for sure it is highly possible to ban btc in their country by the government.
nope if someone knows how to work and he knows how bitcoin is not visible to utilize many ways such as mixers, I'm sure anonymously on bitcoin to hide them from the government, I think it's not a problem to use bitcoin for anything