Stolfi is one of the biggest trolls here.
Trolls use opinions as nothing more than bait to get a rise out of people. I get the sense that Stolfi honestly believes in what he argues. Maybe I'm wrong, and if I am, then he has successfully trolled me.
In his case it's to get attention. He always says the exact opposite of your argument. Just to make you reply to him. The more and longer you reply to him the better he feels.
He will do this on any subject. Now it's Bitcoin because this forum is busy and the topic is hot. But if this forum would be gone tomorrow he'd find another busy one. About bagels, he doesn't care. As long as he can het attention.