This is speculation, of course, but I'd note that this guy already knows the maximum sentence meted out for similar violations. He seems to have weighed the loss versus his "gain". What gain? I'd speculate that trolls often do not have the actual opinion they post. They post opinions, or statements which CAUSE something. They want to see cumulative or severe REACTION to what they post. They are fishing for anger, and strong reaction to posts. They are trying to find "meme" approaches which WORK to achieve strong reaction. They may post something racist, because it's effective at getting a strong reaction back. It likely does not matter to them, whether they believer it or not. That's not important.