“A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.”  — The Second Amendment

The battle over guns has proven to be one of the most dangerous in America’s culture wars — and with the murder of 58 people in Las Vegas Sunday night, the debate over how to regulate them has begun again.

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When a gun carries that kind of cultural significance, it’s “a powerful image to fight against,” if you’re a gun control advocate, said John Donohue, a Stanford University law professor and gun policy expert, “and one that is largely immune from rational discussion.”