The worst part of this is how irreversible it is. With a bank you might be able to get it back, with cash nobody can just siphon the actual paper money remotely, but with bitcoin you're out of luck.
Nobody would keep $500,000 in cash sitting around their house, but that's essentially what this guy did.
I've witnessed stacks of cash far in excess of that.
However, when it is done, there is usually a fair bit of armament around the cash, and the kinds of people that keep that sort of cash on hand are also not the sort you want to commit an amateur robbery against.