I think the man with the gun is the same Todd shown on this healthcare site. He would be considered a Covid-19 high risk individual based on a 2016-2017 diagnosis of stage 4 lung cancer. Not excusing the behavior, but I can see why he might have elevated concerns over mask use.
https://www.signature-healthcare.org/SignatureHealthcare/media/PDF/Your-Signature-Moments-Spring-2019-Newsletter.pdf
