sulieman... u missed a few names... ted bundy, the boston strangler, bela kiss, ian brady & myra hindley (the moor murderers), paul bernando & karla homolka (husband/wife team), peter kurtuen (vampire of dusseldorf) and the most famous of all --- jack the ripper!!!

soniya... i agree with you that their mind set was disgusting... however, if you look at their backgrounds, most of them suffered sexual abuse in its most vile form... parents were violent alcoholics not to mention poverty was a striking factor...

but then, there were some who did it for pure satisfaction like peter kurtuen who i mentioned above... he used to derive satisfaction from killing like a kid derives satisfaction in a candy store...