Well, if you kind of think about it, Blake knows he is a clone. He's known it from his creation in a vat. He managed to keep his independence, despite the attempt at brainwashing, and presumed torture. They wanted him evil, he's fought against it and succeeded.
He fears his past.
He doesn't want to be the villain again, and he certainly doesn't want his adopted children to live the horrors that he did. Though yeah, they still turned out to be horrible. I mean, the assaulted Punchy when there was the threat that he could lose everything - the safe haven - he worked hard for. Is it an artificial comfort zone, or is Blake even smarter than just being awesome?