Not true. Selphie was all for shooting President Deling with a rocket launcher or skinning the Moonba to sneak out of the Desert Prison.
She also had no qualms about letting missiles drop on probably other populated areas, as long as the Garden was safe.
Selphie is a cute and adorable girl but that masks her violent, murderous nature.
And it's awesome.
Oh and just to kind of be on-topic, being a superior Final Fantasy doesn't mean being a superior game. Example: FFXII felt more like a Final Fantasy than X did but I think X was vastly superior when it come to story and most of the characters.
It's simply the fact 12's style seemed more in-line with FF than 10's.