Seat belts were invented, then hardly used. Car manufacturers didn't want the public to think cars were unsafe. Only because of legislation did the modern seat belt come to all cars. But, then, of course they are there because of the law. We don't pass laws requiring things that are already satisfactory.
Growing your own food would take most of the free time that most people have. That's why most people don't do it, and that makes it similar to building your own car. It's not the same because, tautologically, it's not the same. Both of those are examples of things that people don't do because they would make modern life impractical. And by "modern" I mean for the last thousand years or so.
Critique food labels if you want to, but we didn't have them before the laws. Now we do. I like them and use them frequently and every time I do, the benefit I receive is because of regulation, not because the manufacturers are swell folks.
You know what would be super awesome? If we lived in a universe where people were honest, caring, ethical, didn't lie about what was in the products they sold, wanted to sell safe products, where market forces were good enough to produce good safe products, and where we didn't need big government to legislate where the market fails. That would be awesome! Alas, here we are, stuck in this universe.