In my opinion, I think Lacus was never intended to be portrayed as someone who persuaded people to agree with her ideals, in the case of Athrun it was more of her supposedly being kind of like a guide to help him decide on what he wants to do and not be JUST another soldier.
With Lacus and Kira, during the time in plants, I don't really see her having to convince with to do anything, in fact all she did was comfort him for his past actions which Kira clearly has issues with. It was his own decision to get back in the war.
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