Arnold try to read what the professionals are saying here. The aircraft in question didn't run low on fuel, it just didn't have the required fuel to continue to destination.
In all likelyhood the crew departed LAX knowing they were going to be tight on fuel, and would have known that a tech stop (fuel stop) would be a reasonable possibility, and this would have been planned for. This is not unusual in longhaul airline operations, what would you have them do..not depart LAX?
Don't jump on here and criticise posts, when it's obvious that you don't know what you're on about.