so much for philosophy

from this:

Here is what baffles Mnookin most: How so many caring, well-educated, affluent parents came to buy leaky theories that vaccines cause autism. How 48 states allow parents to exempt their kids from vaccines for religious reasons, and how in 18 states all you need is a philosophical reason. How, in 2010, the journal Pediatrics reported that a staggering 25 percent of parents believed that vaccines can cause developmental disorders in healthy children. How, even after a 2002 study in the New England Journal of Medicine found no link between MMR and autism, the anti-vaccine camp grew stronger.


so I guess the ranking goes:
1) prudential reason
2) religious reason
3) philosophical reason
4) grunt prefaced by "'cuz"