You're mixing apples and potatoes here. Bitcoin mostly uses soft-forks in order to improve its capabilities. Bitcoin has never used any kind of coin-control or bailouts which is exactly what ETH is going to do. If they do that, ETH is not immutable. Period.
Forking to remove 184 billion Bitcoins is a form of
coin control.
Do you understand that Bitcoin was forked to address an issue created by a bug
in the Bitcoin code?
It was not forked because a transaction script did not do what someone expected as DoOverCoin is proposing to do.