Luk 19:42 Saying, If thou hadst known, even thou, at least in this thy day, the things which belong unto thy peace! but now they are hid from thine eyes.
Luk 19:43 For the days shall come upon thee, that thine enemies shall cast a trench about thee, and compass thee round, and keep thee in on every side,
Luk 19:44 And shall lay thee even with the ground, and thy children within thee; and they shall not leave in thee one stone upon another; because thou knewest not the time of thy visitation.
Israel did not know the day of their visitation,that Messiah is here,and Jesus came unto His own,but His own did not receive Him,and Jesus said,that the Jews shall not see Him again,until they say,blessed is He that comes in the name of the Lord.
So I suppose since Jesus came at that particular point in time,to that generation,and they rejected Him,which the Pharisees,and Sadducees,asked Him for a sign from heaven,and Jesus said,a wicked and adulterous generation seeks after a sign,and said it would be more tolerable for Sodom,and Gomorrah,in the day of judgment,which is the most critical time for the nation of Israel,that the blood of all that had been slain concerning those that did right in Israel,to turn them to the truth,will fall upon that generation,for they reject Christ,who is the truth,trying to turn them to the truth,and part of all those prophets,that they approved of being slain,because that generation rejects them for telling them to turn to the truth,and they will eventually go against Jesus too,like the prophets.
In other words,that generation represents all that is disobedient concerning all the times Israel was disobedient,by not taking heed to the prophets sent to them to turn them to the truth,and since Jesus visited that generation,and they rejected Him,that all that have been slain concerning righteous men,trying to turn them to the truth,and even as far back as Abel,all the righteous men that did right by God,and was slain by those that did not care to listen to what is right,they shall bear the blame of it all,and their shed blood shall be upon that generation,for out of all the generations concerning Israel,that rebelled against truth,and went against the prophets,they had the greatest prophet,Jesus,and witness to the truth,doing miracles in the sight of them,and they rejected Him,which Jesus said,the queen of Sheba shall rise up,and condemn that generation,for she traveled far to hear the wisdom of Solomon,and behold a greater than Solomon is here,and Nineveh turned from their evil ways,at the preaching of Jonah,and behold a greater than Jonah is here.
It appears as if all the blood is charged against that generation concerning all in the Old Testament,and Jesus,for Jesus said from Abel to Zechariah.
Rev 18:23 And the light of a candle shall shine no more at all in thee; and the voice of the bridegroom and of the bride shall be heard no more at all in thee: for thy merchants were the great men of the earth; for by thy sorceries were all nations deceived.
Rev 18:24 And in her was found the blood of prophets, and of saints, and of all that were slain upon the earth.
But all the blood is charged against Babylon,of all who have ever been slain on earth,no matter who it was,or what the time period,because Babylon represents the kingdom of man,and all who have been unrighteous on earth,for you either belong to the kingdom of God,or Babylon,the kingdom of man.