#2 is not necessarily wrong. In #1, the speaker is saying that it is possible that 'he' is a good father, or conceding that he is. In #2 the speaker has some evidence to suggest that it is logically certain that 'He' is a good father.
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seagullNow I think that "Indeed [It is true] S is ..., but..." is rather similar to "S must be ..., but..." Is that right? What is your opinion?I depends on what you mean by similar. With Indeed it is true that S is ..., there is 100% certainty in the speaker' mind.