Crypto lets you engage in any contract you and your counterparty can codify. The reason that so many scams are run through crypto is because the vast majority of people either don't use smart contracts (in which case you're just sending your money to someone and praying), or if they do, they don't read or understand the smart contracts they're using.

The solution to this is maturity. The endgame is to be able to create smart contracts that are as readable to a layperson, if not more readable, than legal contracts. And to come up with a set of standard smart contract templates vetted by programmers, just as today we have a set of standard legal contract templates vetted by lawyers.

That, and encouraging people to actually read what they sign, whether it's a pen-and-paper signature or a cryptographic signature.