Never worked for any space agency, did work in place where they had huge tanks of fuel worth millions of dollars that would equally be dangerous should they explode. The side was so big I guarantee that anyone wanting to walk up to them could do so because the security can't stop them in time due to the distance. Now they would get caught and stopped after entering and security cameras and whatnot, but what this guy did where he took pictures could be easily accomplished. Remember, millions at stake, high danger of death and injury and yet anyone can walk up to something and take pictures or worse sabotage it. Nobody works on the presumption they will be targeted and the security is there to catch someone more than being able to prevent everyone from getting in.