I disagree.
I think it's one of those beliefs that's been swept under the carpet.
Probaby because it was never given a name.
You mean a name like "selection missed one"?
I'll play along...
Let's assume for a moment that there is a "serial killer" gene... a result of a mutation -- anyone who has this gene is going to grow up to be an ax-murdering sociopath.
Now, what kind of mutation is this: beneficial, neutral, or harmful? Harmful, of course -- not just for everyone around the person, but also (due to the environment) the carrier.
Why is it harmful? Because our environment, which we (sometimes ironically) refer to as "civilization," tends to lock up ax-murdering sociopaths... which severely reduces the chances of them breeding and passing on the "serial killer" gene.
Of course, there's a difference between a "severely reduced" chance and no chance at all, isn't there? So, in addition to the mutation that causes a serial killer, there's also the possibility that this bad gene can be passed on...
Fortunately, as we are not currently up to our armpits in ax-murdering sociopaths, it would seem that the mutation itself is quite rare... let's say 1/100,000,000 for the sake of argument... furthermore, if the "serial killer" gene is recessive, it would mean that two carriers would have to have a child, and even then, IIR my high-school genetics correctly, the child only has a 25% chance of being an ax-murdering sociopath...
...good odds, but with seven billion people in the gene pool, even the longest odds come up once in a while...