Differing regulations and standards between countries usually makes no sense and just harms the consumer.
How is a Volvo made for the Swedish market unsafe on Canadian roads? EU and Canada recently signed a trade agreement so that they won't tariff eachothers' cars, but consumers still can't buy a car from a European dealer and have it shipped over.
Or vaccines. Why isn't there a global approval system?
Yeah yeah, everyone can point to an example where their regulatory agency's anxieties/delays/negligence prevented some issue, but fail to consider the impacts of all of their other delays/rejections.