The baptism questions relating to disfellowshipping are very vague and certainly do not introduce the idea of doubts. They certainly do not go into detail of how this affects the disfellowshipped person and family relations. It is worth remembering that at the point of baptism you are not thinking about going back on the decision so will gloss over the 2 or 3 questions with a feeling that it will never apply to you. It is only via the watchtower articles that the true impact of disfellowshipping is discussed.
Also bear in mind that some who are baptised are minors and so discussion of fornication and the like is not something they have ever faced.