1. Because history has proven that an unarmed populace is a complaint populace. Democrats are all about controlling every aspect of our life, and the only way they can do that is of we cannot fight back.
2. As soon as they chip away enough at our Constitutional rights to make it possible. Since they can't do it with brute force they will try to finesse people to willingly give up their rights, i.e., march in favor or banning guns.
3. My alternative is for both sides of the debate to realize that while what we are currently doing isn't working, most gun owners aren't guilty of any crimes regardless of what types of guns they own. We need to realize that murder is the result of human thoughts and actions, not guns. We need to have a real debate and come to real solutions that will keep guns out of the hands of bad people while protecting my rights and the rights of millions of other gun owners.
4. Sadly, it isn't only democrats. It is mlstly democrats, but there are lawmakers on both sides who would gladly burn our Constitution for a few votes. Term limots for every elected office would be a great start.