I your point(s) everyone, but the constitution has 1 grave weakness: it can be changed by 2/3 majority vote (at least over here).
Therefore, if someone would have enough influence in congress, they could simply rip out the 2nd amendment and suddenly, everyone with a gun would be a criminal.

I know this is unlikely to happen, but the theory is sound.

Btw, I know it is in your constitution, but is the idea of a militia still useful?
After all, the defense of a country falls to the military and national garde. If you believe in the lawfullness of the government, militias should be unnecessary.
If you don't believe in the lawfullness of the government as an armed militia, you are labeled terrorist and removed. And even if you aren't detained, shooting at the army with rifles isn't going to do you any good if you are againste apache helicopters and abrams tanks.

I don't write these words to troll or insult the US citizens here. I am genuinly trying to understand this issue because it is completely foreign to europeans.
If it is more apropriate to have this discussion elsewhere, could a moderator please move it to a separate thread because I don't want to cause bad feelings.