Please remain civil on HN, even when you feel strongly and someone else feels heartless.
He was saying that the problem with capital punishment is that citizens are willing to accept a 4% failure rate.
That's an is, not an ought, and HN has a real problem distinguishing between those two concepts.
For all we know, Rayiner is categorically opposed to capital punishment. It shouldn't be incumbent on commenters to provide a bill of bona fides for every non-normative descriptive comment they make. More information should improve a good discussion no matter what the commenter's personal beliefs are.
I assume getting death penalty is also big-swinging-dick status for the prosecutor.