You testify AGAINST YOURSELVES that you are the descendants of those who murdered the prophets

How did the Pharisees incriminate themselves?

ESV, Matthew 23:

29 “Woe to you, scribes and Pharisees, hypocrites!

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Jesus accused them of being hypocrites. They said one thing and did another.

For you build the tombs of the prophets and decorate the monuments of the righteous, 30 saying, ‘If we had lived in the days of our fathers [F1], we would not have taken part with them [F1] in shedding the blood of the prophets.’

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F1 killed the prophets.

They said they would not have joined F1, the bad people, to persecute the good prophets. In reality, they were persecuting Jesus, the good prophet. They were hypocrites.

They failed to distinguish between the people who lived in the old days and the bad people who killed the prophets. They called F1 their "fathers". If they thought F1 were bad, why would they acknowledge them as their fathers?

31 Thus you witness against yourselves that you are sons of those who murdered the prophets.

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Their own words (Freudian slip?) testified against them. They incriminated themselves by calling F1 their fathers.

32 Fill up, then, the measure of your fathers [F1].

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Sure, like father like son, continue and finish the job of your murderous fathers.

According to Jesus' logic, how did the Pharisees incriminate themselves in Mt 23:30?

The Pharisees incriminated themselves by their hypocrisy and Freudian slip.