i know why Jesus cried. it was because they would never understand. they wouldn't live long enough to. Jesus felt sorrow in his heart because the people were so ignorant. they were so ignorant that they blocked themselves, in that life, from knowing Truth and becoming one with the Master Idea.
it's like watching someone commit suicide. except it's hundreds, thousands, millions of people. and they don't understand. Jesus didn't cry for his pain. He cried for theirs. But they are so ignorant. So ignorant, they will never understand, or even comprehend that they have pain. That is the real loss. They can never be healed, unless they understand.