He literally did this after the DAO hack.
>It was initially unclear as to whether the fork would be executed. Though it was proposed by Ethereum developers, they did not have the unilateral power to implement the change. Miners, exchanges, and node operators also had to agree to update their software. After more heated debate in public forums, on July 20, 2016, at block 192,000, the Ethereum hard fork was implemented.
https://www.gemini.com/cryptopedia/the-dao-hack-makerdao#sec...
There have been many large ETH compromises since then, and the idea of forking for any of them would be considered outrageous.
This is pretty well documented in the Cryptopians book; the DAO hard fork was driven almost exclusively by people outside the EF.