In v7 Paul sees the Pharisees and Sadducees coming out to him.
I read a good description of them in an article on the web, ” A perhaps-overly generalized way to think about the differences between the Pharisees and the Sadducees in the times of Jesus was to see the Pharisees as Scripturally liberal (because they added oral traditions to its commands), but conservative in politics (because they opposed the Romans); and the Sadducees as Scripturally conservative (because they rejected oral tradition), but liberal in politics (because they sought to fit in with the Romans).” They were generally presented as proud hypocritical men, who were threatened by Jesus’ teachings, and as a result in conflict with Him.
So as they came out to see him, probably to see what the big deal was (see the prior post). When John saw them coming, it was very obvious to a man of God that they were generally up to no good. He does not pay them respect or honor and take them aside to confer, as they probably would at least expect, but he confronts them in front of everyone! Why do this? I think that it may be the only way to get thru to them, and also to point out to the people at the same time, that they need to be wary of these ‘so-called’ leaders of the community.
In most cases, these groups would rely on the fact that they were Jews, God’s “Chosen” people, and so they were above anything, (ala descendants of Abraham). John corrects that fact, and lets them know that your heritage means nothing! (note the stones comment!) It’s all about a repentant heart, and if they dont have it, they better get it fast, or they will be “de-throned” like a tree being cut down.
I could see how John’s teaching in this would encourage the idea of a Messiah that is a more militant leader, who is going to take charge and lead changes and the people. Even John seems confused later on when he sends his servants to ask Jesus if He is the one, though when Jesus shows to be baptized, there is no question. I think everyone (Jews) was confused with their perception of the Messiah they had built up in their minds over the years.
In any case, it was obvious that the Sadducees and Pharisees were in the wrong here, and it teaches us to speak out against that which we know is wrong!