America has decentralized governance. Every state, and even every county, can determine their own rules to a large extent. Money is handed from the federal government to the states with very few strings attached. It is constitutionally impossible to have a “one size fits all” approach, and also people are so independent-minded that any iron fist is immediately given the middle finger.
Articles like these that harp on about how bad America is seem to be unable to explain why so many people want to come here, and why we have to pass laws to prevent them from coming. For all America’s warts it’s still the best place to live.