Never confuse lack of will with lack of skill...
“When you feel the urge to reach into someone’s chest, pull out their still beating heart, and jump up and down on their lifeless corpse, it’s rarely because of their lack of skill”.
So said my HR Director (!) when speaking about the difference between those who don’t have the capability to do what you need, and those who could do it, but just can’t be bothered.
It’s an important distinction to make.