You are being too rational. There is no evidence that the lead in bullet is harming the environment - but obviously lead is "nasty stuff" and we are not allowed to have it in paint, or in solder, so it is a logical extension that it must be banned in all the components of ammunition (It has already been replaced in primer compound)I will be a devils advocate and throw a "acceptance of toxins" in the equation - Alcohol.
Deaths every year are more than 50 people (just a number, not a fact) that die from alcohol poisoning, but it's okay (it's not okay, but in the eyes of the law it is...).
There is nothing more certain than lead in bullets will be banned in this country. It is only a matter of time before lead is banned in the ammo in all Olympic shooting sports, and it will be banned on all ranges in this country. The fact that we have been living with it for a century or more without significant harmful effects will have no impact whatsoever on this matter.The lead law will be a EU law, but as we have all voted, this will soon not apply to us, unless we export the venison.