You're right. I was born an Afghan refugee in Iran. I've seen compassion from Canadians from all walks of life, devoted to ensuring that refugees come to welcoming communities in Canada and that the supports are there. That compassion continues to inspire me; it's an important part of who we are as Canadians, and it's to be applauded.
With respect to ISIS fighters, Canada's police and security agencies work to the highest professional standards every single day to keep Canadians safe. That's true in the case you're referring to and every other case.
With respect to terrorists returning to Canada—