Fruit, as I see it, children, first and foremost, belong to their parents. I don't see how it's possible for a child to "belong to a community" before belonging to his/her parents. If someone converts to Christianity, their children don't automatically belong to the community more than they do their parents. That sounds like something Hillary Clinton would come up with.
Also remember, once a person converts, he is she is as Jewish as anyone who is born Jewish. So I don't think I agree about the man's children belonging "to the Jewish community" more than to their father. (For that matter, I don't know if they have children, as I haven't seen the couple in years.)
Another thing is, there is no compulsion in converting to Judaism. Like Yacov said in an earlier post, potential converts are often discouraged initially. This is to make sure that the convert is sincere in his intentions. Also, conversion is not a simple process. There is a lot of studying and learning involved. And from what my friend told me, the Reform conversion (not that I'm advocating anything Reform) was not that quick and easy either. So I think it's safe to say, the young man, whose name I forget, converted of his own free will.
And for whatever it's worth, they appeared to me to very happy together.