I am unsure what Jesus means,
Woe to you who build memorials to the prophets whom your fathers killed.
Consequently you give consent or they killed them and you do the building.
Clearly the prophets are the good men delivering the word of God, their fathers (the pervious generation) killed them because they would not accept the word and turned against God and hated the prophets.
But why kill the ones building the memorial, is it because they are kind of doing lip service and still not following God.
I read on to see that their genation ie the ones building the memorial would be charged with the sins of the previous generation.
Do you think this generation are unrepentant , that’s what I conclude but not sure thanks.