Really bad

[In no particular order.]
Don't take my word for ANYTHING. Thou shalt educate THYSELF. Thou shalt not believe anything that ANYONE tells you and Thou shalt TRUST NO-ONE ...until proven BEYOND A REASONABLE DOUBT.

Osama bin Laden

Ariel Sharon

The Ayatollahs

Yasser Arafat - American blood on his hands? - corrupt and insistent on leading his people down the path of disaster again and again (not that they didn't willingly go, the idiots)

Hosni Mubarak, Hugo Chavez, Fidel Castro and similar despots

Avigdor Lieberman

The people trying to stop an honest accounting of the execution of an innocent man in Texas - http://www.newyorker.com/reporting/2009/09/07/090907fa_fact_grann?yrail

Rabbi Ovadiah Yosef

http://en.wikipedia.org/wiki/John_Money - It takes a special kind of evil to take a defenseless child and talk his parents (not without fault for being gullible and looking for medical information in the media) into allowing him to experimentally re-assign the child's gender via surgery and hormones. Also, a pedophile with an "extensive collection" of extreme pornography, incl. necrophilia.