a currency that can be stolen just by breaking into a safe or making a copy of it seems far more
risky than one with good encryption and people seem to still use cash?
I see this argument a lot, but it's wrong. If I'm holding cash, it's usually a few hundred at most. I'm willing to risk losing that knowing that I probably won't be able to get it back. Anything more than that I put in the bank because I know the bank and government give me safeguards. There's little to no chance I lose that money.
Unless bitcoin's intent is to just represent petty amounts, it will need to more secure and provide consumers with safeguards. If it doesn't, it will only be used in libertarian fantasy world.