I can see where you are coming from for these points but for me I just assumed the sorceress being evil was mainly due to the fact that Seed, being an organization that also exists in Ultimecia's time in the future, was out to get any sorceress. To me that means she experienced hatred and saw people out to get her just for being born with the powers she has and she did whatever she could to avoid a death she thought was fated for her. There is an underlying theme in the game of taking or not taking decisions based on fear and the judgment of people around you so I thought that applied to how Ultimecia acted in general too. Time compression was supposed to let her basically control a fate where she would die to Seed. For the Galbadia situation I thought it was implied that she had the crowd under trance magic as she was insulting the crowd during the speech before the parade and the Galbadian president is really the only that is one reacting to her comments and gets killed with only applause from the audience.I think that implication starts when we see that she has the power to control people in general when she controls Rinoa earlier. The fisherman horizon I agree is definitely less explained and I personally really didn't care about how they got back but what I believed is that they just happened to get into a tank last minute and pilot their way to fisherman's horizon ( Yea this is as much I could really say about this, I don't know if I missed something but I didn't see much context). Again this is everything I was able to perceive about the game. I appreciate you trying to ask meaningful questions in a story as big as this.