I'm claiming neither Kindly nor you actually believe the argument you've given.
Your overconfidence in your mind-reading abilities is noted.
Except you're not doing that [...]
The fact that someone doesn't act as a perfect utility maximizer doesn't mean that utility gains aren't worth seeking, for them out for others. If you ask "why did you buy that thing?" and I say I bought it because it was half the price of the alternative, am I refuted if you point out that I don't always buy the cheapest things I can?
As I said: a reason, not the only possible reason.
How do you distinguish the part of your ethics that you ignore in practice, e.g., not giving all your money to charity, from the part you insist you and everybody follow, e.g., not killing Joe even though he's being really really annoying.
Link to Blog Post: "Extremism in Thought Experiments is No Vice"
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