These sites are included because of general stupidity. I expect to see a few of the Pseudoscience sites included here also Multi-Level Marketing Get rich quick, just forget about things like mathematics, the population of the world, and how many friends you would like to still have at the end of the year. A pyramid scheme is a pyramid scheme, even if black-letter law pretends it is not. A lot of these will end up in the Liars category as well. You can read a commentary about multi-level marketing here.
Some people are just stupid.
Some are just bigoted and uninformed. Some people naively believe and repeat the lies of others. Some tell deliberate lies. The sites listed under this category belong to the liars. Nobody could continue to believe this crap, so by saying it they admit to being liars.