Re: Surviving Vulcan Elders.
Forget Vulcan. Again, forget time travel. Think forward.
You are walking by a house. You see a child drowning. You can swim. The gate is open. Do you intervene?
You know that there is a bomb in a building that will go off in three days. Do you warn the authorities?
You're walking next to a blind person who is about to step of a ledge. Do you warn him?
But you can't remove time travel from Spock's issue. In his case, he knows his younger self dealt with those issues. He learned from them and caused him to become the person he became. By doing it himself, he's making it so his younger self can't.
"Libertarianism is a good idea on paper, until you look at it."
-Greg Proops, The Smartest Man in the World