Why doe some people think vultures are evil?

Vultures are eat carcasses (dead animals), and dead and rotting things are attributed with sickness, disease, and well death. So in most peoples minds they think of vultures as unclean or evil creatures.

one Relevant quote from the christian bible:

Leviticus 11:13

These are the birds you are to regard as unclean and not eat because they are unclean: the eagle, the vulture, the black vulture.