pain?

What does Kottke mean, “John Oliver’s 22 minutes of pain for Donald Trump“? That segment, you can be sure, caused zero seconds of pain to Trump or to anyone who supports him. Everything Oliver said is completely true and is also absolutely ineffectual, utterly useless. If there is one person in America who is now thinking “I was going to vote for Trump until that John Oliver takedown” I’ll eat my hat.