Well, I would have to disagree with the accuracy of those remarks. In many nations with a very low homicide rate, and an all but nonexistent serial homicide rate, there is no basis to suggest that they are just more likely to get away with it and not get caught. Aside from the fact that a string of very similar and related murders would be a sensational event, they're police forces are just as effective if not more so than the US. By example, Japan and Germany pop to mind.
It's also worth noting that Germany, France, Spain, and Italy had a two-century burst of the serial killer phenomenon in the 1600s and 1700s that for whatever reason faded away by and large.
Most interesting, we will hear from Dennis Rader himself. He spoke to KSN News on a general news story back in 2001. It was a surprise to us, and with what police have said Saturday, Raders life is a surprise to the entire city. Dennis Rader, the man now thought to be BTK, allegedly fooled police for decades. Now scores of Kansans are learning that he apparently fooled them as well. "Its the biggest shock Id ever had -- the nicest guy in the world. Id have given him a key to watch my dog if I had to when I was leaving town," said Gary Van Dusen, neighbor.
Rader was a churchgoer at Christ Lutheran Church in north Wichita. He was not just any member of the church, he was president of the Congregation Council
Videotape interview of Radar before he was revealed BTK
http://www.ksn.com/news/stories/7036051.html
FWIW, my perspective as a Christian:
I believe we have more instances of serial killers and some other forms of violence because we are by and large a Christian nation, and therefore are targeted by demonic forces.
I believe there is a war between good and evil, and Satan isn't going to bother with those who are no threat to him.
And your evidenece of this statement is er, where?