I'm not saying otherwise.

There's a difference between acknowledging a possible problem and a call to action. The Bitcoin network is and will be secure in the medium term. And maybe this problem does not even happen in the future. But denying it (or at least the possibility of it) will not make it go away. I'd rather be aware and prepared.

AskSN

Are you comfortable with Bitcoin's security model?

Any "defense strategy" I've heard of is just central planning, which would be bitcoin's certain death. Sure bitcoin may fail, but we don't have to weaken it by micro managing miner revenue.