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An analogy:
Alcohol and tobacco are both far more hazardous to health than many newer recreational drugs, such as Ectstasy. However alcohol and tobacco are so deeply embedded into our lives that the Government wouldn't seek to ban them. (The USA tried, but gave up). It's only when newer hazards come to the attention of 'the authorities' that they are legislated against.
Likewise, if the motor car hadn't yet been invented, and governments were asked to consider the environmental impacts of internal combustion engines, diesel engines, wankel engines and electric vehicles, the internal combustion engine would certainly be banned but no government would currently dare to do so.
Established devices and technologies are generally accepted, whereas 'innovations' tend to come under closer scrutiny.
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