It would depend upon the odds. I’d have to at least talk to a Doctor - and, indeed, apparently this guy knew someone who could explain those odds (his Father-in-law).
Let’s put it this way - if he felt it was safe enough for his wife to travel with him, then I doubt if he thought it was going to pose any serious risk to people on the plane.
To put it more bluntly - faced with something like a one in one thousand chance of infecting someone else and a nearly one hundred percent chance of dying if trapped where I was, I’d opt for the latter every time, and I think that most people who claim otherwise and feign outrage are lying or not being serious.
See post #7. This guy posed a threat and didn't give a shit who he could hurt. It seems you take the same position.