My Autism is maximum and I cannot into NPC. Someone else will have to handle this.
If nobody else is handling this, then:
"This is true. Your son was killed, and as his father, you had a lot of influence in the way he lived his life. At the time, there was no way that you could have known that your son would die like this, and no way you could have prevented it.
You loved your son - which is why you regret his death. You didn't want him dead, and if it was within your power to stop his death, you'd do it.
A Different person, with Different choices, might have changed this. But you are not a different person. You are Douglas Cartland, P.I., and you have to make do with limited knowledge like everyone else.
The things that have happened in the past, your regrets, you could not possibly have stopped. You can learn from them, and stop more mistakes in future, but you'll never stop every single bad thing from happening to everyone.
There will always be mistakes you've made, which you regret, and that you've learned from. But you've learned all you can from what you've seen here, and all you'll gain from staying in these thoughts is pain.
Let the memory go, and let the past be laid to rest."