Live_Free_Or_Die not trolling. He posts pretty harshly, confrontationally, and maybe overconfidently on issues of legal terminology, but he's posted here in good faith for a long time. Importantly, he's not exactly defending the income tax, so to speak. He's defending its legality on technical grounds, but he still recognizes it as extortion/theft.
Galileo, on the other hand is a bit dogmatic, and he tends to accuse anyone who disagrees with him of being a troll. He's called me a troll, he's called Amy a troll in this very thread, he's calling Live_Free_Or_Die a troll, and I honestly couldn't count how many honest regulars he has called a troll, simply for disagreeing with him. I'd take his opinion on who is and isn't a troll with a grain of salt.
I don't know who's actually correct on the question of the income tax's Constitutionality. I mean, it's pretty obvious that an income tax signed into law in 1861 and 1862 by Abraham Lincoln of all people is not itself strong evidence of Constitutionality, since a.) unconstitutional laws are passed all the time, and b.) this was the same guy who destroyed federalism...and I guess this is partially how he funded it.

Similarly, Supreme Court decisions by themselves should be taken with a grain of salt, since the SC regularly rules in a manner totally contradictory to the text of the Constitution.