If air show needs to be scrapped surely it should not be because of traumatized refugees. These folks got safe haven and freedom from persecution in Canada and should be eternally grateful for that. In this vast country there are many paces where one would never hear a sound of military aircraft. 
It appears to me that much of what we are doing as a society lately, is running around looking for every victim to coddle and over-protect. We are becoming a nation where half of population are victims of something and the other half just caters to them and then they switch. Millions of people are vulnerable one way or another, we can't endlessly change everything to create maximum comfort for every one , sometime people have to take responsibility to  do it themselves without making everyone else jump.