1. They deny he purchased the gun he used from them. So that is an invalid point.
2. Do you have link confirming that gun shop is out of business?
3. How is this a rational business decision?
Today's announcement only affects a few more specialty stores they operate under a different brand name. We'll see whether it was a good business decision going forward.
Considering how close they came to selling Cruz his murder weapon, I'd say yes it was.