I'm still trying to understand your point....here is what the entire verse says...
29“Woe to you, scribes and Pharisees, hypocrites! For you build the tombs of the prophets and decorate the monuments of the righteous,
30saying, ‘If we had lived in the days of our fathers, we would not have taken part with them in shedding the blood of the prophets.’
31Thus you witness against yourselves that you are sons of those who murdered the prophets.
32Fill up, then, the measure of your fathers.
33You serpents, you brood of vipers, how are you to escape being sentenced to hell?
34Therefore I send you prophets and wise men and scribes, some of whom you will kill and crucify, and some you will flog in your synagogues and persecute from town to town,
35so that on you may come all the righteous blood shed on earth, from the blood of righteous Abel to the blood of Zechariah the son of Barachiah,
fwhom you murdered between the sanctuary and the altar.
36Truly, I say to you, all these things will come upon this generation.