Shark finning is like this: you’re going for a walk, when suddenly some people grab you and pull you into a car. They chop off both your arms and both your legs and then shove you onto the pavement to bleed to death.
Why would you do that to someone?
Add to that the fact that walking is what makes you breathe so you suffocate to death after a quadruple amputation.
Sharks breathe by moving through the water. Finning them causes them to die a slow painful death.