(a) the US seems to working its way to tyranny just fine with the 2nd amendment intact.

(b) many other countries seem to do a pretty passable imitation of freedom without a 2nd amendment.

Update:

(c) on closer examination, it almost seems like an "opiate for the people" kind of thing: people being lulled into thinking they are free because they can kill innocent children with their high-powered weapons when the fact is that actual armed insurrection against the government is as ludicrously impossible with those weapons as it is without.

At the same time, real freedoms have been largely eliminated, habeas corpus is gone, 4th amendment largely gone, freedom of speech going away, freedom of assembly AWOL, elections manipulated and legislators bought, the president can have anyone incarcerated indefinitely without charges and without a trial, or summarily executed by simply labeling them a "terrorist" (and those labels fly looser every day). Focusing on these issues will have a much larger impact on actual liberty than trying to prevent meaningful gun control.

Yet, yay, we are "free" because we have our Glocks. Yeah, right.