Well they who is Israel certainly pierced Him but they have yet to look upon Him. They denied Him but when He returns in power and glory then they will see Him as Messiah and weep.This has already happened hasn't it? The spirit of grace was poured out when Christ came and they looked upon him whom they pierced. John says "they shall look on him whom they pierced" was fulfulled at the cross.
John 19:36-37 KJV
For these things were done, that the scripture should be fulfilled, A bone of him shall not be broken. [37] And again another scripture saith, They shall look on him whom they pierced.
For the cause of Christ
Roger