The project itself made mistakes early on by not sufficiently warning people of the risks of the DAO, which gave justification for the do-over. I think they can be excused given the DAO was the very first smart contract of its kind, and given how much was deposited in the DAO so quickly, which was totally unexpected.
So I think Ethereum can easily be forgiven for the DAO and subsequent hard fork to redo it. It was a highly experimental technology, that saw a major hack of a early-stage application that was only aiming to attract $500,000 of ETH, but had ended up having $150 million worth of ETH deposited in it, when the ecosystem and the state of the technology were not ready.