Don't buy if you don't like company policy, no need to have a law. There is plenty of choice in the US. Some companies even offer 90 days (again, no laws required).
I'd find it tiresome real quick to always have to research before purchasing anything if the vendor will treat me with respect. Having a baseline of what you can expect from any business relation guaranteed by law is pretty great, really.
Really? There are tons of ways to cheat and game any system, including consumer protection. No laws can close this completely. Darwin award is still a thing and will always be.