Hi - I frequent another science forum, and the OP here is very trolly indeed, and has been banned over there - they posted this same post there today as well, and is probably the same previously banned poster for similar posts in the past.
Why banned? Well, its a pretty rare occurrence, but this is how it's going to go on this thread:
* initial post about bloodsucking
* replies calling for evidence
* "evidence" in form of 1934 article in Nazi propaganda publication Der Sturm and other articles regarding Jewish ritual murders
* realisation that troll poster is talking about the massively debunked blood libel, and it's all gone a bit anti semitic.
Thanks for reading.