If you get the proper context for the pharisees and sadducees, you'll see Jesus parable is not implying they were the just.

They were the sons of those who conspired with the seleucid greeks, to kick out the sons of Aaron from the temple service and the leadership after the Maccabeean war. They were all about power, no matter the human cost.

Under their rulling, Herod "the Great" ordered the killing of the boys in Bethlehem.

What happened to the sons of Aaron ?

They went into the Qumran desert, the Arava (Isaiah 40:3), and they've made the Dead Sea Scrolls. John the Baptist was one of them (Luke 1:5 & John 1:23).

For a very good reason John and Jesus called the pharisees and sadducees "a brood of vipers", which resonates the song of Moses, in Deut.32:31-33 (and see Rev.15:2 - this problem persists, through zionism)

When we get this background context strait, there's a whole new layer to unpack in the NT. See for example how John 10 argument starts and finishes. Another aspect is the callendar dispute, which also solves the dispute about the year of the crucifixion (30CE).