Jesus' strongest and clearest denunciation of the Pharisees came in Matthew 23
Was it because his frustration level reached his limit?
Was it because he finally had enough?
Was it because he was going to have the last word before they killed him?
Was it because he had justification for all things them did to him?
No, he was not trying to win an argument or put them in their place
His last and strongest words were spoken to wake them up
He was trying to open their hearts and win them over to God