The last sentence comes off as a rhetorical sleight of hand. You can be against censorship of books and music and still believe that the government has a role to play in regulating dangerous goods like plutonium. The trade of goods with an outsized environmental impact is regulated today, though this mostly shows up as restrictions on chemicals that are themselves direct pollutants.
Sure, you can be against anything, pro anything, and believe in anything. What I believe is what I wrote, you can believe governments should control plutonium if you want.