You are comparing two unlike things. One is a serial killer, the other is an act of war decided upon by a committee. But let's pretend the bombing was just one dude who did it for fun. They are both evil because they both kill. However, the person who killed millions is more destructive.

Of course, you are still comparing someone who has an attempted murder on his hands vs someone who literally burnt thousands of men, women, and children alive because she was throwing a tantrum.

Sorry, but Dany is evil. She probably has the highest body count in the show.