It does sound silly, but if this guy was a serial killer he could have killed more people on his way to Pennsylvania.
So some people would certainly wonder.
Still, it is very important in times like this to be very patient and avoid public idle speculation.
News reporters too often straddle the line between newsworthy and speculation.
Judge Jeanine on the Five just said that her sources told her that the suspect was tracked by genetic DNA
23 and Me, Ancestry.com, etc???
YMMV