These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Complete Monster: Brainiac is a Control Freak and genocidal psychopath on a galactic scale. Brainiac seeks knowledge and feels the best to do that is to shrink and then steal a major city from a planet and then destroy the planet. He stole Kandor from Krypton (he didn't bother blowing up Krypton because he knew that Krypton would soon be destroyed by natural causes). Then he attacks another planet, again shrinking and stealing a city and then uses a device that causes the planet's Sun to go Nova, thus killing the remaining inhabitants on the planet. Brainiac also sends his drones to the planets he is attacking and the drones proceed to kill random inhabitants of the planet. He later steals Metropolis and tries to destroy Earth in a similar manner. He also tortures Superman for information and tries to experiment on Supergirl.