Whereas law enforcement also sees that, say I use a blank shotgun shell to make a retort to scare someone. And then that causes them to die of a heart attack due to a weak heart. I am to blame for manslaughter. That's because it doesn't matter the health status of a person - if I caused it, im to blame.

Unless you're law enforcement. They're... uh, special.

Edit: downtopic, user:revelation said it best. It's called the Eggshell Skull Rule. https://en.wikipedia.org/wiki/Eggshell_skull