The Instapundit explains to David Brooks how Trump is mostly his fault. 

When politeness and orderliness are met with contempt and betrayal, do not be surprised if the response is something less polite, and less orderly. Brooks closes his Trump column with Psalm 73, but a more appropriate verse is Hosea 8:7 “For they have sown the wind, and they shall reap the whirlwind.” Trump’s ascendance is a symptom of a colossal failure among America’s political leaders, of which Brooks’ mean-spirited insularity is only a tiny part. God help us all.

Indeed.