Alright, I think I get it, but I might come up with more questions later. :-)

What Joseph and the others did was wrong, there's no doubt about that, but it was, in part, borne out of a need to survive and the lack of other methods to control their bloodlust. There were, of course, other aspects of racism and a superiority complex as well though. They could have found ways to control themselves, but they did not think it was worthwhile to try.

I'm fine with vampires being able to be "made" or turned, but I think they have to be able to be born as their own race as well. Otherwise, they would die out. Once the vampires could be controlled, they would not be able to turn enough humans to sustain their race. As far as humans wanting to be turned, there would be a few, but it's a choice between a short life with freedom or a longer life with little to no free will. I was thinking that most humans just chose to keep their lives as they were. So I've been thinking of them as having the ability to breed (though with lower fertility rates than humans), and that physiologically, they are more like an alien or other species than undead. As far as being able to turn humans, the "right" kind of bite would have to alter them on a cellular level and change them physiologically.