Maybe the people who want that man to be released from prison perceive the same man as some kind of fighter against the system or something similar - and what he did was definitely against the system and the law. This is a big absurdity, because it is undeniable that his "creation" made a lot of bad things possible, but it obviously doesn't matter to people (especially in the US) what that man did, because drugs, murders and weapons are something they live with every day.
I think that those people are very delusional. Yes, that man went against the system and the law but that doesn't mean it's a good thing. Laws aren't bad, they are necessary but the problem is that the government itself doesn't protect the law and many people find it irritating but that doesn't mean that we should obey those laws. He made website purely for generating millions of dollars through that marketplace. Was he checking each batch of drugs that were sold on his website? No, he simply didn't care. To my mind, drugs are the only thing that shouldn't be punishable but that's a different subject.
The government bans guns selling but does someone really think it's good if we obey that law? The less people have the gun, the better for everyone's safety. It was also possible to hire a hitman on his website. This guy was not a good guy, he definitely had serious mental problems and was super greedy. Even in illegal businesses, people should have some morale and rules.
Mr. Donald just listens to what the crowd is shouting and uses his power to fulfill their demands. One man who should be released from prison is nothing compared to all those votes he secured with that promise.
Yes, he does whatever brings him votes and that's very sad. Populism is never a good idea because the crowd is never smart and following their directions will only lead to failure.