It is possible that somebody threatened a massacre if she were to speak. It is possibly true that the police were unable to ensure that no weapons would be brought into the venue, or at least into a nearby parking lot.
The factually wrong part is “because of lax gun laws in Utah“. We’re talking here about a person who is willing to commit murder. A fortiori such a person would be willing to violate gun laws.
The meme author could claim that had gun control laws in Utah been strict, guns wouldn’t have been unavailable. This assumes that:
- The same police force that fails to deny criminals access to illegal drugs would be able to deny access to guns.
- That criminals will not be able to manufacture guns on their own.
h/t Sanford Begley