Ultimecia a misunderstood hero? Well Im all for the R-U theory but my explanation would be a mix of Ultimecia being left alone in time ,going insane and trying to destroy time itself seeing as she was immortal unless someone literally murdered her or Maybe she was trying to use the compression to reunite herself with Squall and the past. Sure she tried to killhim to achieve it but by then she was pretty insane. Flawed but its just a theory.