The British policy of salutary neglect toward the American colonies inadvertently contributed to the American Revolution. This was because during the period of salutary neglect, when the British government wasn't enforcing its laws in the colonies, the colonists became accustomed to governing themselves.
Explanation:
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In general the common argument is "This development paved the way for the use of nuclear energy". There are of course cons to nuclear power as well, but these are known.