‘Astonishingly cruel’: Alabama seeks to test execution method on death row ‘guinea pig’

The executions aren't done by doctors, as that goes against their hypocratic oath. It's not even done by nurses in a lot of cases. They're done by people who have barely any training. Botched executions are a dime a dozen because of this.

or even pardoned if they suffered greatly

Uh, no.

I think you may be underestimating the types of people on death row and the crimes they have committed. Which is understandable as most people don't really encounter people like that and don't really consider the true horror the crimes committed

These people (and I'm assuming guilt has been correctly assigned here for the purposes of the argument) have committed horrific crimes. Raping and murdering children, wiping out entire familys, abudction then torture then murder, those kinds of things.

For example, the case of Johnny Johnson: https://youtu.be/ntpK9D3935o (warning: this crime is about as bad as it gets and is described in detail here). I won't describe the crime here. The video is worth a watch if you're curious but you have been warned.

There is no pardoning that. Ever. Under no circumstances should they ever be allowed to walk among us ever again. Even under the strictest possible supervision.

These crimes are so awful that we simply cannot forgive, and these people cannot be rehabilitated, and no second chance should be granted.

Death penalty or not (to which I can see both sides of the argument and is probably still something to be debated but isn't the point of this comment) I can't envision any solution of pardoning these criminals is ever acceptable.