The problem isn’t what they bought it’s what they sold. It was all correlated. Loans to startups were going bad while startups were pulling deposits since they weren’t getting funded. So you’re taking losses while losing capital. Doesn’t really matter what else you’re holding at that point if it doesn’t happen to be skyrocketing right now. Long term bonds will never be that thing, but at any point in time almost nothing else would be, either.