Because you lose a lot of ‘freedom’. You cannot enforce as strictly as Singapore (where spiting gum on the street is illegal and such) without a lot of enforcem

Because you lose a lot of ‘freedom’. You cannot enforce as strictly as Singapore (where spiting gum on the street is illegal and such) without a lot of enforcement and that goes against the US constitution; to protect the state, Singapore for instance has gun laws that will get you fined, jailed and lashes if you have a gun or bullets or both. Singapore has free speech in the constitution but it’s not quite that free, again to make sure the state can have full control. These things are currently not compatible with the values of the US.