This is a legitimate subject and in my opinion worthy of discussion. Stereotypes are very real in our society and we are all guilty. So many times on this very forum we hear from our Jewish friends about Kielce pogrom and Polish anti-semitism. Reading the accounts of that tragic event brings us back to the subject at hand. Kielce Pogrom was sparked by allegations of blood libel, a rumor that a Christian boy was abducted by the Jewish community.
I just don't get it. When there are accusations towards others by Jews it is said; yes there are some idiots that would do such a terrible deed but when the Jews are accused of something, it's absurd, its ridicules, it's a lie and so on. There are Idiots in every nationality and religion including Judaism and some Jews are idiots themselves, simply denying it will not make it go away or make it a lie.
Just go to any bookstores on-line and type in Jewish mysticism, you will see how many books have been written on the subject. Since there are so many books out there on the market dealing with this particular subject, It stands to reason that there is a great interest on the subject, and the idea of practitioners is not farfetched now is it?
You'd think that after hundreds of years explaining why it can't be true, people would get it.
We all have civil laws that prohibit us from doing certain acts. Religion or the community itself dictates how we should behave and what our morals should be like. Although it works for most of the people a small portion of the population will break those rules hence we have crime. So you simply telling me that it can't be because of X is not good enough unless you call yourself perfect in every aspect and without any human weakness like greed, envy, sexual desire that drives some amongst us to commit unspeakable acts.
Throughout human history every imaginable and unspeakable crime known to us have been committed. Just because it is so horrible, so cruel or on such a large scale that it seems like a work of fiction doesn't mean it has not happened. Looking back at the last century what do we see Hitler, Stalin, Pol Pot just to name a few. Some people still deny some of the events that happened during WWII, denying it on the basis of sheer scale, technology, resources and man power needed.
Every religion and community out there has some sort of devil worshiping cult or just a cult and Judaism is no different in that aspect to any other group of people out there. Just like any other society, a very small percentage but they do exist. I'm not saying it is true, because I have never seen it myself or know anyone that did; on the other hand, I do not dismiss it as easily as others do, because as human beings we are capable of unspeakable crimes, as to the motivation to commit such a crime I think history has shown us that it won't take much to justify almost anything we as humans do.
Here is a film depicting a Jewish girl speaking on the very same subject in present day US. Not the greatest of sources but there it is. It goes to show that it's not just in the past but in modern times as well that we do deal with this subject.