Jesus comes triumphantly to His city, but the leaders do not accept Him. Jesus tells stories convicting them of their treachery.
How this is about Jesus
He is the King who comes to His own, but His own do not receive Him
Sins this reveals
Selfishness of us as people. We want it both ways, to have life and health and prosperity given to us by our King, and to use it how we want to, not how God wants us to.
Hypocrisy - we may acknowledge Jesus for a minute in the parade, but when He actually claims authority, we balk.