Skridlov, watch the top film i posted on my post about three up, I agree with what you are saying, It almost makes one think they were disabled not to be able to fly, but not sufficently to prevent them being rebuilt in the future back in the USA. But would you want to fly in an aircraft where you do not know what has been poured into the oil or fuel tanks?
All they needed to do was drive a truck of which there were many, in reverse down the line smashing into the fuselages and wings, job done, use the same trucks and reverse into those in the Hangars and push them against each other into the back wall, job done, you could crush them into pulp in no time at all. anything like a search or deice truck drive it into the Hercs and spear them through the cockpit / cabin etc.
I see the ground power sets have oil under them all so either pipes have been cut or the sump plugs have been pulled and the sets run until they seized.