Sex was a topic humanity could never avoid, and naturally one serial killers could never avoid either. When selecting victims, gender was an extremely important factor—indeed, the most important factor in most cases.
But from what Schiller knew of Jonathan Crane, he had no interest in sex. He even regarded it with contempt, believing it to be a lowly, primitive expression, while what he ought to pursue was something nobler and purer.
Jonathan was an anti-instinctualist. The reason he dressed himself as Scarecrow was actually to turn himself into a symbol—something "nonhuman."
He believed that state elevated him above all ordinary life. It was even the fundamental reason he could harm ordinary people without qualms, treating them with the mentality of a judge.
Therefore, the core of this case actually conflicted with Jonathan's nature. Jonathan believed himself different from ordinary people, and since he had dressed himself up as Scarecrow, he would not dress his victims up as Scarecrow as well.
Especially when these victims were law enforcement officers, the people he hated most. He would not elevate them; he believed they did not deserve it.
But Schiller knew Jonathan had committed these crimes. He had even proudly published a paper within the club, outlining ideas very similar to what Jena had sensed.
To say it again, a dog could not stop eating shit. A person's personality would not change so easily, especially not a born antisocial like Jonathan. He would not suddenly behave in a way that contradicted his character. Even if he had truly been forced into it, he would not have flaunted it everywhere as though it were something glorious. He would have hidden it before anyone found out.
That made Schiller realize something was wrong.
Then there was the Nygma serial murder case. That case was