The idea that the 2nd amendment is some sort of magic defense against any and all gun laws is simply false. It is so broadly accepted because the gun lobby works hard to pretend that we actually hold other parts of the constitution to such lofty standards.
There are a lot of people who seem to hold half of the second Amendment as the only real part of the Constitution (well, except in many sad cases, the three-fifths compromise).
But, yeah, there's damn sure room for regulation. You can't go into any gun store and buy a nuclear weapon, or a howitzer, or a cannon, for example. Finding the right place to draw the line is what an adult country would do, rather than preempt every attempt to discuss it with "The liberal gubmint is coming to take your guns and turn your daughters into gay muslims."
[edit: you can actually own a cannon and presumably a howitzer, but it's pretty strictly regulated. Feel free to just substitute sidewinder and RPG (which I assume and won't bother to research if they're legal for people to own). It's more an illustrative example anyway, but I feel like I need to point this out because the typical response of "You don't even know gun laws" will come and ignore the greater point, as is typical in non-adults.]
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