It is important to make a distinction of regulations based upon real and verified harm (ex post facto) and those that are pre-emptive.
In the former, the capitalists who invested in DDT lost considerable amounts of money. They paid for the risk they took in bringing a product to market.
Pre-emptive regulation seeks to undermine the free market by preventing products which consumers would, if allowed to exercise their liberty, wish to purchase. This smacks of the opportunity for political abuse, especially by competitors who wish to hobble an adversary.
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