Intuitively the longer a path is the more likely it is to be broken when you start randomly removing edges, and before you remove edges the shortest path from U

Intuitively the longer a path is the more likely it is to be broken when you start randomly removing edges, and before you remove edges the shortest path from U1 to V2 is the shortest path from U1 to V1 plus a post. Therefore it seems like the path from U1 to V2 is more likely to be broken than the path from U1 to V1.