The problem with smart contracts isn't that there are bugs, but that buggy results are final with little to no recourse, by design, unless you get everyone to agree to hard fork the chain (rolling the "bad" transactions back and eplacing the buggy contract) and/or the implementation (if the bug was in the platform rather than the contract).
The legal system has a similar principle of not being liable for conduct that predates a ruling or law that forbids it, but it also has the principle of agreements being interpreted according to common sense understanding by a person with ordinary skill, and where skill differences exist between them the non-expert's interpretation is the one given precedence.
These meta rules don't have equivalents in smart contract systems, which makes them brittle. The only way smart contracts end up being used for non-trivial purposes is if they are made explicitly subordinate to the existing legal infrastructure in ways that will gum up the works, or if smart contracts are subject to mandatory formal verification possibly including game theoretic 2nd order effects.
