In one word, the best reason to let the assault weapons ban die is this: Republicans. I used to support gun control and thought the rethugs who loved their guns were nuts. I still believe they are nuts but now, they run the government. Their unsuccessful attempt to annul the 96 election by impeaching Clinton and their more successful theft of the 2000 election are pretty clear evidence that those people are not (small d) democrats.
I was livid when Florida went down and most Democrats rolled over for it (Gore included). I suppose it was, as the Declaration says, that most are "disposed to suffer, while Evils are sufferable." But can any of you doubt that the Bush administration has been "a long Train of Abuses and Usurpations, pursuing invariably the same Object, [and] evinces a Design to reduce [us] under absolute Despotism"?
Four years on and a great many Democrats and not a few sensible Republicans and independants have realized just how different and dangerous the ascendant 'Timothy McVeigh wing' of the Republican party is. If they steal should steal the next election too, it will finally be time to exercise our second amendment rights.