It's funny because if you're going to indulge in fallacy to get your point across, at least appeal to the right authority. Only problem with that is it's pretty hard to find an authority that doesn't believe in some form of the harm principle. The closest I can think of is John Stuart Mill, who said, quote:

"Society can and does execute its own mandates ... it practises a social tyranny more formidable than many kinds of political oppression, since, though not usually upheld by such extreme penalties, it leaves fewer means of escape, penetrating much more deeply into the details of life, and enslaving the soul itself. Protection, therefore, against the tyranny of the magistrate is not enough..."

Which is along the lines of the views pitched here... and Mill _invented_ the harm principle!

I do smile a lot. The alternative is a sinking feeling when I read sites like the one linked here that I personally feel like wouldn't exist if the creators embraced a little more empathy and understanding of natural rights.