Similar thing has been happening in France since the lockdown and 1 million Parisians fleeing Paris. In the region of Bretagne several cars with Paris plates have actually been vandalised [1] (first article that I could find, in French).
Not that vandalism is in any way an appropriate response, but people moving away from high infection areas is a big way in how the infection is spreading. Definitely a very selfish move.
If you believed your family was currently virus free but at increased risk of death because of high virus infection rates in your surroundings, would you do anything different than what these people are “selfishly” doing?
I live in Italy in a city with several hundred cases. I have a country house, and we're not moving there. We stay the fuck at home and we are under 50, we'll be fine. Don't be that guy, stay were you are.
