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politicians who are ultimately at faultIn a democracy, it is the voters who are ultimately at fault.
But perhaps more to the point, it is the system that is at fault, and the system is very complex: institutions, physical infrastructure, social mores, common beliefs, canonical media and stories, traditions, language, ....
You can’t just point fingers at individual people in a large imperfect system and pretend that swapping them would fix it. Troubleshooting and improving large complex systems is really hard and improvements are usually incremental, except sometimes in extraordinary crises.