He’s the best given the current climate and geopolitical realities that tie the hands of a country like the USA who could take him out if there was no issue with the aftermath of such an attack. There is plenty to be concerned about and a bunch of unknowns that ultimately protects him from retribution.
Sure the US could probably drop the middle of some sort onto his residence, but that would create a global crisis. Every time they did that in the past the person who took over was worse than the one the US got rid of.
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