Predictable knee-jerk reaction.
"Canadians have a responsibility to act."

Having been identified by G&M a number of years ago as having "talent for marshalling the economic arguments for immigration," you know that economic responsibility MUST be our immigration rationale. What's suddenly changed?  US conditions, NOT domestic conditions.  So, why not simply stay the course? 

"Canada enjoys a reputation for being open and global... This is a test of whether we deserve this reputation or not."  What test?  Has our economic argument for (more and sudden) immigration changed overnight?  Compared to the US our rep. looks great today--don't have to change a thing!

"Canada must take the lead in establishing a global response to this action."  Nonsense. We don't need to sell ourselves and "take the lead" in anything.  Things go from bad to worse out there, they'll come begging.  We can determine who, from where and how many.  

But thanks anyway, nice you've got our interests at heart.