This, but unironically. Science is, and has always been, about adjusting our flawed, incomplete models as new evidence emerge. We shouldn't let our ill-informe

This, but unironically. Science is, and has always been, about adjusting our flawed, incomplete models as new evidence emerge. We shouldn't let our ill-informed preconceptions prevent humanity from moving forward. If removing blood from the body takes forever chemicals with it and we have no practical way of filtering those chemicals out, then discarding the blood (yes, bloodletting) is the moral way to do it. Irrational and uneducated biases need not apply.