This is just more of the attempt to rehabilitate his own image by pushing the claim of Casey abuse to the next stage. The murder was an an accident ... but even if it wasn't an accident Casey was so screwed up from years of abuse that murder is OK ... and even if the years of abuse don't make the murder OK, the murder is still OK because her kid was a genetic throwback ... and so on and so on.
Just more rationalizing for the defense of an evil scumbag by another evil scumbag.
Yep.