The question is, why is the federal government allowing these vehicles to be sold / why are states allowing them to be registered? If they don't meet federal s

The question is, why is the federal government allowing these vehicles to be sold / why are states allowing them to be registered? If they don't meet federal standards, they're not legal to operate on US roads. They weren't even legal to import, which means they should be confiscated and destroyed. Customs was fond of doing this for illegally imported Skylines and Land Rovers...why not brand new Porsches?