What kind of justice would Thara want for Reactron then, I'm wondering? Earth justice? It was the US Government that sent orders for Reactron to kill Zor-El (or Supergirl) in the first place. I have a hard time believing that someone like Thara, seeped in Kryptonian history and culture, would not want the murderer of her "father" brought before Kryptonian justice. Kal-El wouldn't because he views Earth as his home.. In the beginning Kara maybe wouldn't have but Thara, who served as Zor-El's security and failed to save him, objecting to handing Reactron over to New Krypton? I ain't buying.
But then the fickle Earthlings and the cardboard-villian Sam Lane have done something I never thought possible when "New Krypton" started - root for Allura.