I do not think we know what his convicitions are. We hear what he says they are, but then we realize he's not really telling the truth about his feelings.
He says he does not even mourn for his son because his son died for his country. This is a noble death, he seems to be saying and so there is no need to mourn. If this is how he really feels, it is a very patriotic sentiment. So you would say he is a true patriot.
But then he breaks down when the woman asks if his son is really dead. This tells me he didn't really believe that stuff he was saying.
So I don't know what convictions he has -- I just know he's a parent who is devastated by the loss of his son.