We're spending over $19 billion a year on drug interdiction in this country, yet drugs are still easily available. Let's say we spend just as much on gun interdiction...it'll be just as ineffective. All the criminals would still have guns, just like they all still sell drugs.
Think about it: criminals get their money by selling drugs. This means they're already smuggling tons of illegal materials into the country. How hard is it to put some guns in with the coca?
How about the countries with more gun rights? Switzerland, for example, where the crime rate is vanishingly low? You have no point left to argue, so I won't.
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