Travelling through the book, the reader is introduced to a range of character studies complemented by descriptions of real people, including Marilyn Monroe, whose early sorrows blighted the rest of her life. Are the people he describes odd? Yes. Is there a consistent underlying explanation for their oddness? No: brain function is complex, many different personality types are involved and all such categorisations are bound to be messy.
Is it feasible to cure evil? That is a far more interesting question than Mr Baron-Cohen acknowledges. He suggests that society should have empathy for those who lack it and that they should receive treatment: a puff of the hormone oxytocin, might do the trick. Whether it can be right to cure someone of what is not yet considered a disease remains unaddressed.