system
Given the following post, respond as if you're commenting on Reddit:
human
[Umbrella Academy] How does The Commission determine what’s the correct timeline and who to assassinate?

For example, The Commission determined that Vanya destroying the world at the end of Season 1 was “correct” timeline. What led them to believe that was the way to go? Why say the world needed to be destroyed by her in 2019? What’s the process for determining the timeline to preserve?
gpt
Politics.  The person in charge decides what's best.  It's not necessarily agreeable, but as demonstrated... The Handler has her agenda when and how things should play out.  If it's for some greater "good" or her self interest, or just to make Five suffer.

Also, in season 2 we see ... >!Carmichael has a different agenda than The Handler.  It's apparent some want JFK to NOT be assassinated, which otherwise brings about an earlier apocalypse than 2019 and some who DO, which restores history's correct turn of events.  Additionally someone else's decision might actually see the end of the world NOT occur in 2019.  It depends on who is in charge and what their motivation is.!<