Right, exactly: not the most logical of plots.
I don't know why you'd say that. Yes, it was a bit contrived to tack on the Earth-in-danger thing, but they grounded it in the Picard-Shinzon relationship which is the emotional core of the movie, and that works perfectly well from a character standpoint.
Anyway, I don't want to become one of those people who drags a completely unrelated thread off-topic to renew a pet argument about an old movie. This is supposed to be about Tomalak.