@Romeo Fabulini,
The unfortunate lady. Romeo, chose herself. I think a court can over-rule someone else choosing.
I give a rat's arse about this matter. How the practice may have arisen, for example. Or did it serve some purpose?
Human rituals usually have some sensible source even if most of us think it is no longer the case.
And you are always careful, as media is, your programmer, to choose the life threatening example when there might be a lot more cases where life was not threatened. Many people have regretted being given another person's blood. Maybe it is because the process devalues blood to the level of a commodity.
Suppose they gave you a few pints of a water-drinker's blood. Your hair might turn white on the spot.
It is a bit risky belittling the stated settled practice of a group with a significant following. They may well forgive infringements easily anyway. Risky in the sense of avoiding looking foolish which I know is quite difficult to do these days.