It ties into the nature vs nurture side of it. Master criminals are as much made as born that way. If it's heritable rather than random it opens up a whole new line of thought.
Did you not read the article? This is not about "nature vs nurture". They already know that there's an obvious nature and nurture component that can influence everyone's development, including ASPD. What makes this research new and interesting is that it focuses specifically on the genetic component of this, and specifically ties certain genes or sets of genes to ASPD. If accurate, it means you would know with a pretty significant scientific evidence that people with certain sets of genes are much more likely to be criminals, regardless of the "nurture" component. That could have a lot of implications.