Trust in, and disagreements over monetary policy may actually be at the root of many of the problems you outline. The euro crisis was likely a significant contributing factor to Brexit. The US bailouts of 2008 are still are source of political contention.

Yes Ethereum forked, but that actually gives users a choice, and still does. Some people who disagree with the choice to step in can still run and transact using Ethereum Classic. With both Bitcoin & Ethereum, market forces seem to be doing a decent job of maintaining consensus.