I hesitated adding those links here because of the very high amount of downvotes I'm getting, which means most of you don't like the message I'm passing, anyway, I think you are acting out of emotion, there you go:

Contains links to laws in the US that can be used against bitcoins:

http://www.usmint.gov/consumer/?action=archives#NORFED

Thesis showing that most parallel currencies are illegal (including in the US):

http://repositorio.bce.unb.br/bitstream/10482/9485/1/2011_Ma...

Bank Palmas created a 'social currency', it is a crime here, they escaped jail in 2003, but then in 2011 things got ugly:

http://empreendedorsocial.blogfolha.uol.com.br/2012/07/11/um...