>If governments are always looking for more humane methods of execution
They’re not. Most governments have banned execution, the countries that still do it do so because they or a segment of their population likes the punishment aspect. It has to be unpleasant, that’s the entire point.
It’d be very easy to kill people by asphyxiating them with nitrogen, which would be cheap and completely painless – just restrain them in an airtight room, cycle the air out to remove CO2 but only pump in nitrogen, they’ll just go woozy, pass out, and after a few minutes die. But it doesn’t make for a very good spectacle.
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