Its not a factor of defending himself - its taking a stand.
If, as I believe, he did it because he knows theres no risk he should say so to further buttress governors who are reopening under attacks.
Thats called leadership.
If Pence is asked a direct question, he can give a direct answer. Absent that, he should just go about his business. THAT is leadership.
Hospitals don't require visitors to wear masks always when visiting other types of victims under normal times, he was just following normal protocol as a LEADER, just as he did when he visited Steve Scalise who had been shot as an act of political malice, Pence did not wear a mask on that day either , so why is there a difference now if the message is going to be it is safe to reopen the country? This was a message to tell us all these types of victims are not as contagious as we are led to believe, and this is Leadership, people would have to be blind to not know what he was doing and how much he and Trump with experts have discussed when they go out, will they be wearing or not wearing masks to set an example
Mike Pence visits Steve Scalise in the hospital
https://www.washingtonexaminer.com/mike-pence-visits-steve-scalise-in-the-hospital