You could throw numerous, almost-comical examples at them but unfortunately the irony would likely to be either ignored or merely unnoticed.
It's as if the 2ns Amendment is so engrained into their psyche that reasoned, logical discussion is impossible for people who'd normally be rational.
We're a strange bunch here. "Freedom", whatever that means, is something not to be trifled with to many here. Any change is also seen as failure to many. It's part of the ticking time bomb that will eventually go off, I'm convinced. Rural vs City, Educated vs uneducated, white vs minority, the list goes on, it's going to come to a breaking point. You add in the polarised view that social media provides, and it's gasoline on a fire. People are able to cherry pick factoids that support their arguments, and completely ignore other factoids that exist.
Take for example, the 2nd amendment, it's just amazing how some people won't even entertain the notion of having a discussion about it. Yet we had an amendment to the constitution, the 18th, that LITERALLY outlawed alcohol in the early 1900s. It was obvioulsy a colossal failure and it was repealed. But the 2nd amendment somehow is sacred. Something that was written at a time when the only guns that existed were muskets that took one minute to load and we were trying to expand our land holdings westward. No amount of context will change peoples' minds.
It's quite scary actually