The crime rates will skyrocket if any felon is allowed to carry. The process we use for a permit is not all that bad. I personally like knowing theres a system in place that is purposefully made for the good guys to carry guns, and the bad guys be forced to do it illegally - increasing their chances of punishment. Does the 2nd amendment apply to fellons? In my opinion the law exists to reflect God's wishes on humanity, thereby our constitutional rights do as well.
Genesis 4. In this chapter, we read about the first murder. Cain decided to kill his brother rather than get right with God. There were no guns available, although there may well have been a knife. Whether it was a knife or a rock, the Bible does not say. The point is, the evil in Cain’s heart was the cause of the murder, not the availability of the murder weapon.
God’s response was not to ban rocks or knives, or whatever, but to banish the murderer. Later (see Gen. 9:5-6) God instituted capital punishment.