It is Carl Sagan's book and so it is up to him, I suppose, what criteria he uses to uphold his arguments. But surely a lesser degree of skepticism should be used in cases of claimed sexual abuse.
Alien Abduction allegations:
1. More than likely are not true as there has not been any evidence returned as proof that these have ever happened.
2. Mostly they would be dealing with adults, who though traumatised, are better able to come to terms with whatever happened to them.
3. The experience only affects the person themselves and not to any large extent their families.
Child Sexual Abuse
1. Are most often true allegations and there is plenty of proof in the shape of cigarette burns, bruises and the results of starvation etc. There are no doubt false allegations, and false memories, but there are plenty of only too true cases.
2. Mostly they would be dealing with children who can be injured for life or often die from the experiences.
3. The experience affects the whole family and often the whole community.
It is vital that children who report abuse should be believed. Not so vital that an alien abductee be believed.
If CS is correct and psychiatrists use the same methods to retrieve memories of alien abuse as those to retrieve sexual abuse, and he accuses them of asking leading questions, then there is something intrinsically wrong with the system.