I think it’s definitely worth doing some serious math first before publicly writing it off. Even if its a marginal benefit, as long as its just a tiny bit greater than the marginal benefit you get from intentionally avoiding exposures as much as reasonably possible, then over time the PFAS levels will come down slowly but steadily

Secondly, no its not okay to give people contaminated blood. But the blood is contaminated with something basically everyone is contaminated with already, and the person who needs transfusion will likely die without it, so it is kind of moot.

But after only a few more moments of thought, if we were really concerned about it, we could just perform the dialysis on all the donated blood and plasma after it has been taken where we have economies of scale and nobody needs to be hooked up to a machine for it

Once the plasma is collected, I wonder if you can perform dialysis on it at an enormous scale to protect future recipients while still keeping things economical.

Describing donating a pint of blood every several weeks as “regular bloodletting” is really something. I mean I guess in a literal sense that is what is happening, but they literally will not take your blood if it is not safe to do so, including donating too recently.

Edit: by the way, after thinking about this for only a few moments longer, i have realized you can probably do even better just by donating plasma only, and now you are not even losing your blood cells.