require gun purchasers to show ID when they buy guns so the amount of guns bought will be tracked by the government

When someone buys medicine such as Sudafed, they are required to show ID so the government track the amount of Sudafed they have purchased and make sure they are not running a meth lab.
This type of law should apply to guns. Anyone who wants to purchase a gun should be required to show ID so the government can track the amount of guns a person has purchased. This would help in making sure another tragedy like the one in Aurora, Colorado never happens again.