The first part of forgiveness is acceptance. Instead of being mad at someone for not being what they could be, you accept that this is what they are, and they will not change or grow.

You don't get mad at a scorpion for stinging. That is what they do. You don't get mad a toad for being a toad and doing what toads do.

"You could have been an astronaut! I am so mad at you toad!"

It doesn't work.

So when you truly understand that the person that killed your son is unable to empathize, plan or even truly understand the concept of the future, you find a certain kind of calmness and you forgive them.

Then you are ready to begin take the steps required to protect your community from these creatures.