I'm not sure the Bill of Rights has ever been altered, and it probably won't be.
I agree to a certain extent that people like guns as a dick extension. Fair enough. I also know for a fact that given the founding of the U.S. the people have a latent mistrust of government. The idea that the government will come and take your guns is what some are afraid of as a first step towards allowing a step toward authoritarianism.
Absolutely. It's not just a dick extension, it's more that America as a nation is inherently fearful.
And their response to fear isn't aspirational (i.e. what can we do so that we have less to fear), it's fearful and paranoid.
Compare responses to fears about knife/gun crime in London in the past twenty years, with responses in the US. Here, people became aware that carrying a weapon puts them (and others around them) at greater risk of being hurt - the idea that they are protection has been entirely shot down by evidence - therefore they took a leap of faith and started walking around 'unprotected'. Good things happened
In the States, even among rational reasonable people you encounter, the fear is so widespread. It's very easily manipulated too. The fear of their neighbour, the government, the taxman etc. is well established. Many Americans are faced with the same choices as Londoners had - do I arm myself, or do I not respond to my fear and go out without a weapon. Unforunately a cultural propensity to fear, makes widespread prevalence of weapons likely. And propensity among lawmakers and citizens to lax regulations (and to wilfully or ignorantly not understand their constitution) helps guarantee lots of scared citizens end up murdering/being murdered. When normalised in society, as it in the States (it's not a surprise to hear news of a pre-teen owning and killing with a gun anymore) it's only gets worse without a widespread will from people to stop shitting themselves about silly things. This doesn't seem imminent.