Without the trial and the evidence the police lost we don't have all the facts. But the framing in the article makes it sound like he woke up to his daughter missing, went looking, saw her in the guys car, and pursued. The police argue that he had time to call them while chasing the guy rather than forcing his car off the road and shooting him.
The timing and little details can matter a lot so I don't want to make a judgement, but killing your child's abductor in a chase is a lot different than killing them in cold blood later out of the blue.