In my experience, blood lust is very rare even in the sociopath community (and of course not exclusive to sociopaths). The difficult thing about it is you can never really tell who it will be: you can have some creepy co-worker who turns out to be fine, and another charming one who one day comes to work with a small arsenal. It's hard to tell what is going on there, but here is a reader's description of what it feels like to self-professedly have bloodlust:
Blood cravings or the craving of wanting to hurt someone is weird. I'm holding a fork or a knife or something sharp, and all I want to do is shove it in the throat of the person next to me. I'm curious, but, I know the hell that awaits me if I do it. So I don't. But, I feel the need, the force and thought that pulls me and is pushing me closer to the step where I actually do it. Sometimes, I'm not even angry. I'm fully in control of my emotions and body. But, I keep having images in my head where I step closer and jab and the persons throat. Who, it doesn't matter to me. I've had those images with my friends, people I don't know, even my own mother.
When I'm angry, I have no control. I have lost my temper and destroyed things I shouldn't. I'm more curious than afraid that one day, I'll lose my temper and hurt someone. It could be rather interesting actually. If I end up in a courtroom at least I can plea the "insanity"-plea. Or am I thinking of some other thing?
For me it's more like curiosity. Will the blood pour out of him/her like water? Will it splatter across the room? Will I have to use a lot of force to shove it all the way in? If I pull out the knife, will the blood gash out of her/him like in the movies? Will she scream?
All I know is that IF I do it, unprovoked, I will have one hell of a time explaining it to the police, my family, probably even the media. Who knows? Will my former therapist get an interview in the newspaper? That would actually be fun.
Will I one day give in to the urges? If I do, and I can control it, I will only do it towards those who I see fit to die. Those I hate. Not personally of course, but, to those who I deem evil.