Except the current ones.
Given enough time you’d expect it to happen, but the chances of it happening now are very slim.
Let’s say the Roman Empire lasted ~1,000 years.
If there’s a once in a ~1,000 year event and you warned every day of it, you’d be wrong 99.9998% of the time and right 0.0002% of the time. I’m not sure how useful a warning like that is.
Like, if I’m buying flood insurance, I don’t buy less insurance because I don’t think floods are likely in my area. I buy floor insurance to cover my house.
All risk assessment involves local conditions. Determining what is tail risk and what is likely is a central part of the exercise.
This is not just about bank collapses.
Cyprus was a money grab by the govt. Banks were fine.
There are also examples in this thread of folks getting their money frozen by govt decree.