This slide show relates to climate change, but it pretty much applies to almost everything that the right wants to promote from smoking to gun control.
For example, it was pretty much accepted that the Second Amendment applied only to Article I, Section 8, clause 16 Militias until fairly recently, but there is now "new scholarship" that challenges that interpretation which is funded by the NRA. Note who the speaker was at that conference! Of course, he should have recused himself from the case for bias--it might even be an ethics violation for him.
But, as this suggests, you need to do some thinking for yourself, which most people are adverse.
Besides, the myth is far more comforting.
But, if you have doubt, then you need to do your own research to try and find the truth. My suggestion is to go to primary sources--not Second Amendment "Scholars".