Avatar: The Last Airbender and Legend of Korra both portrayed bloodbending as this wicked art that could only be used for evil, to the point of having the practice banned in Korra’s timeframe.  But… let’s not be too hasty about this.

Bloodbending is the ability to manipulate a person’s fluid-bearing organs, right?  Wouldn’t that kind of ability be a massive asset to a doctor?

Someone has a large wound?  No problem, bloodbending will keep them from bleeding to death.  Pneumonia?  We’ll bend that fluid right out of your lungs.  Heart attacks, strokes, aneurysms, pleurisy… hell, it could probably even be used for completely non-invasive surgery, and applying something like Toph’s seismic sense to bloodbending would be even more effective than an MRI.

I’m just wondering if Aang was aware of the positive applications of bloodbending when he banned it, deciding that the risk of its misuse outweighed its benefits, or if he honestly thought no good could ever come of it.

That’s it, Book 2 of Korra needs to have a bloodbending doctor in it for the sweet, sweet cognitive dissonance.