Discuss the idea that leaders should take care of and respect all voters, including those who may support populist leaders. Also, reflect on the sentiment that many people failed to recognize signs of Donald Trump's alleged mental illness prior to his election.
You seem to forget that many people have voted for Trump and believe he's a fair person. I have met people  admiring Trump in Canada as well. Every leader in every country have 'populist' people among their voters. They need to respect and take care of them as well as their more hopeful and more educated voters.  You're right, leaders should have talked louder BEFORE Trump's election and prevent what's happening now: everybody walks on eggs as not to wake up the monster in power. 
Our main mistake was to think everybody could see Trump's mental illness miles away... Ain't we all fools?!?