Tim didnt tell the whole truth. Of all of what has happened. He was an accomplice with his dad who also didnt tell the truth. They all cover up about what Tim did. Thats a crime.
Anything can be an accident. I accidentally pull a trigger. Does that make me less guilty? Does that make me not a victimizer?
A man was killed and your response is like "It was only an accident. Therefore a cover up is understandable".