In Jason Bourne, we learn that Jason's (David Webb) dad, Richard Webb was a CIA analyst that helped create Treadstone.
We learn later that the asset (Vincent Cassel) killed his dad to persuade Bourne to join Treadstone.
Why?
The CIA recruited U.S. Service members (in the novels) into Treadstone and turned them into assassins, so why did they want Bourne specifically? What was so special about him that they couldn't find in any other U.S. Service member?