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[Even though Mitsuru isn't openly disapproving, Nakama still feels the need to defend her friend, albeit in a mild tone.]
I think, in Tamaki's case, it's just 'cause he really likes making girls feel good about themselves. Like, he always calls me princess, and gives me compliments... not in a sleazy way or anything, though. He never wants anything, he's just really eager to make people happy. So he probably just started the club so that he could do it on a bigger scale.
[Ruefully.] I never know if he's sincere or not, but it's still kinda nice.