Many people love to hear themselves talk.
Surely you've known a few. For the person who wants attention, attacking Masonry is a wonderful way to get that. They also obtain a huge audience of Masons who will try to 'clarify' things, thus giving them a pre-made audience. For someone who believes they can make a quick buck without much work, it's also great. If there are people around who fear a government conspiracy of some kind, all the better.