Doesn't mean they can't learn,

Actually it kind of does. He can learn to fake it and agree with others to get along, but he clearly doesn't understand why people want more than his "reasoning".

There's no shame in recognizing that it's a legitimate disability, and that at some point you have to be happy with just accepting that a certain type of behavior (like demanding the death sentence for bullying) is unacceptable even if they don't understand.

Multiple people have been attempting to explain why it's wrong, and he keeps replying that his reasoning is sufficient for him and he's unable or unwilling to see why that's not good enough for others.