> 3/5 multisig with collaborative custody would likely already be at least as safe as dollar checking accounts.

I think that's off by orders of magnitude. If the whole US did this then I'd expect thousands to screw it up every year.

"Just don't make any mistake, ever" doesn't scale. Not to more people, and not to any one person, given enough time.

It's like running a yellow light (and the occasional red, when you thought it'd be yellow a bit longer). You can go your entire life never being in an accident. But there are accidents every day because people run yellow lights.

At this point we'd both need to go do extensive research at the levels of a full time job to really prove one way or the other.

Suffice it to say we disagree and you seem to have much more trust in institutions than I.