I could counter with, if he was smart enough to commit the crime and hide the evidence so completely, the last thing he would do is a whole string of things that would end up convicting him. That is just as strong "evidence" that he didn't do it as you suggest you have he did. I won't bite.
But one would generally expect that if someone had an innocent reason for doing them, they would likely be able to articulate what it was.
I could counter with, if he was smart enough to commit the crime and hide the evidence so completely, the last thing he would do is a whole string of things that would end up convicting him. That is just as strong "evidence" that he didn't do it as you suggest you have he did. I won't bite.
Many psychopaths are extremely arrogant. They have a certain level of intelligence, but their arrogance drives them to do really dumb things. I had a college roommate who boasted openly about his exploits stealing radar detectors, and showed off his switch blade knife and car-opening tools. He'd tell all sorts of stories about how he was so smart and the police were so stupid. Not sure exactly what happened to him after he got caught with stolen college computer equipment (after I'd moved out the room) and various other contraband.
Scott Peterson might well have gotten away with his crime if he weren't so arrogant. But the very notion that arrogant stupidity disproves psychopathy is absurd.