No, I understand entirely that they're not killing them. I say that's a good thing. I'm also not worried about 3% of them dying as that certainly seems reasonable when compared against the benefits of harvesting their blood. I was merely commenting on the fact that you seemed to be representing their status as not endangered at all - when that's the only sentence you write, you come off as someone that's annoyed by the fact that we're not just killing them, instead of the catch-and-release that actually is going on.
If I was incorrect about your point of view, I apologize, but maybe next provide a little more context - that way you won't have to jump down someone's throat and start typing in all caps like a 12-year-old.