My understanding is that a Captain is in command of his aircraft for all phases of his duty. That includes the planning and safe conduct of the aircraft first and foremost. If the Captain fails to plan correcty taking into account weather etc, ( in this case TS at their destination), through incompetence, negligence or coercion by company policy, then perhaps it's time to look for a new form of employment in another industry. Outside a mechanical failure, there is no excuse for fuel shortage whether you fly a C172 or an A380. Remember the old adage, Proper Planning Prevents Piss Poor Performance.