Am I wrong for wanting to terminate our parental rights to our son because he’s a danger to our family?

Many people don't believe me when I say that my own child is a psychopath but he is. His issue is that he is incapable of remorse and enjoys inflicting pain on others for the fun of it. And he does it with a big smile on his face. If that is not psychopathy, then I don't know what is. He's 10 and is gradually getting worst. He had hurt animals, his siblings, his classmates, and even threaten to kill us (his parents). Nowadays, he has an obsession with knives and even bought one to school on one occasion, which got him expelled. Grounding him and taking him to therapy never worked because he doesn't feel badly about his actions. Every therapist he had seen fired him as a patient. I feel like it's only a matter of time because he kills us. As much as I hate this, I want us to terminate our parental rights, sell our home, change our identities and move far, far away. My husband doesn't want to give up on him but I'm finally ready to. There's nothing that can change him. He is a ticking time bomb. And we have to protect our family and the only way we can do that is to be far away from him.