Luke 3: baptism of tax collectors, pharisees and Jesus

The baptism of John was about purification to be prepared to the coming kingdom of the Lord. John saw purification and repentance going together. We read:

12 Tax men also came to be baptized and said, “Teacher, what should we do?”
13 He told them, “No more extortion—collect only what is required by law.”

The tax collectors were despised by the Jewish community because they were viewed as traitors: Jews who rob their own people in favor of the gentile Romans. It is very interesting that John baptized tax collectors. He saw that even though they were sinners, there was hope and purification for them.

In Matthew3 we read:
7 But when he saw many of the Pharisees and Sadducees coming for baptism, he said to them, “You offspring of vipers, who warned you to flee from the wrath to come? 8 Therefore produce fruit consistent with repentance; 9 and do not assume that you can say to yourselves, ‘We have Abraham as our father’; for I tell you that God is able, from these stones, to raise up children for Abraham. 10 And the axe is already laid at the root of the trees; therefore, every tree that does not bear good fruit is being cut down and thrown into the fire.

In Luke 3 we read:
7 So he was saying to the crowds who were going out to be baptized by him, “You offspring of vipers, who warned you to flee from the wrath to come? 8 Therefore produce fruits that are consistent with repentance, and do not start saying to yourselves, ‘We have Abraham as our father,’ for I say to you that from these stones God is able to raise up children for Abraham. 9 But indeed the axe is already being laid at the root of the trees; so every tree that does not bear good fruit is cut down and thrown into the fire.”

In Matthew, John was angry with the Pharisees and Sadducess, but in Luke 3, John was angry with the crowds. Anyway, John was angry with people who didn't change behavior, didn't repent in fact.

It is very interesting that Jesus went to be baptized, but why? We read:

13 Then Jesus *arrived from Galilee at the Jordan, coming to John to be baptized by him. 14 But John tried to prevent Him, saying, “I have the need to be baptized by You, and yet You are coming to me?” 15 But Jesus, answering, said to him, “Allow it at this time; for in this way it is fitting for us to fulfill all righteousness.” Then he *allowed Him. 16 After He was baptized, Jesus came up immediately from the water; and behold, the heavens were opened, and he saw the Spirit of God descending as a dove and settling on Him, 17 and behold, a voice from the heavens said, “This is My beloved Son, with whom I am well pleased.”

Jesus was baptized to fulfill all righteousness. I think that it means that Jesus had to fulfill everything necessary (in the law) to be right before the Lord, baptism included. Why? We understand that in the cross, Jesus took our sins in our place. We, by other hand, received the purity of Jesus.