Money was initially private and decentralized. When it lost those attributes theft and economic instability became the norm.

I think it's the opposite. Theft and economic instability were the norm until we developed things like economic regulations and a banking system. The Wild West was not known for its economic stability for example. Neither were the Dark Ages.

What passes as economic stability these days just makes things more fragile, e.g. propping up failing businesses w/ other people's money.