The hackers ("hackers") made valid transactions.
The hard fork reversed those transactions.
No matter what fancy spin you put on it, that was absolutely a violation of the blockchain's integrity, as it violated the principle that accepted transactions can't be reversed after the fact, even if you call it an "irregular state-change" that just keeps things secure.
You can absolutely defend the position that this was best for the ETH ecosystem. But it was absolutely a reneging on the blockchain rules.
