[quote=ImportantNobody]
Blowing up the expensive robot could be seen as the joker burning the huge stack of cash in the Dark Night.
[/quote]

If one was playing the Joker, absolutely. However, a douchebag that works for a universe-conquering regime that sent him there with the express purpose of purging that planet of life? Yeah... makes no sense to explode the planet-murdering nuclear doomtank.