This really isn't such a horrible comment. It illustrates nicely that "common sense" is often wrong. There was a similar reaction when radioactive material was stolen in Mexico. People said it should have been escorted with armed guards. But in truth, shipping radioactive material is extremely common. Three million packages of radioactive materials are shipped each year in the U.S. alone. So while it seems like radioactive shipments should have armed guards, it isn't actually practical.
In this case, the truth is that anyone who has the capability to disrupt these cables already knows where they are. But that isn't necessarily intuitively obvious. This is a reminder to all of us that we shouldn't blindly trust intuition, but should try to find numbers or other hard data to back it up.
What? How? It's as dangerous as posting a map of nuclear power plants online. It's not like the cables go into unguarded shacks - the base stations are heavily guarded.