Already Ethereum users make the incorrect argument that bitcoin was hardforked in the past to fix the value overflow bug (it wasn't) and thus its okay for them to manually tamper with the ledger to claw the funds the DAO lost and hand them over to other users. You're seeing a first hand demonstration for how quickly people cling to argument of convenience.
The fallacies used by Ethereum users to justify tampering with the ledger are extreme and are certainly a slippery slope to the end of reliability in the truth and security of the transactions on their chain. They are all the fallacies that support socialism, big government, bailouts, wealth redistribution, etc...
As and when bitcoin becomes more mainstream, it too will have taken on a majority of individuals who do not understand that the whole thing was created precisely to prevent majorities or powerful individuals from violating the property rights of other individuals. This is why making such interventions as hard as possible, if not downright impossible, must remain the top priority of the system.