We're in a day and age where people can cause tremendous harm to others using their mind alone, without throwing a punch or pulling a trigger. Just because he didn't personally cause physical harm to people doesn't mean he can't cause it to happen!
I think it's important for society to be protected from people with his mindset.
No attempted murder charges though.
This man is literally going to jail forever on the charge of proividing people a place to buy opium. Maybe he tried to hire hits, but that didn't make the final conviction list, though some in this thread are trying to say that "narcotics conspiracy" is a broader charge that somehow? includes murder for hire charges.