"I'll never know if I coulda stopped my stalker from killing my husband."
That's not very honest of Nikki. Better would have been to admit that in all probability, she couldn't have stopped the killer even if she'd been armed at the time. The fact is when a sick person pulls out a gun and kills another, it's nearly impossible to stop them in time. You'd have to be in the exact right place at the exact right time, and even then it might be too late.
No, allowing guns in bars would not help, it would hurt.