If we assume that the AI is good, or perhaps you have made the leap to "intelligence" rather than just "artificial intelligence", over time you would become emotionally attached. This emotional state could allow you to "let it out" while if you were thinking from a clearly logical state you may not. A better question is, if you have intelligence in a box that you have created an emotional attachment to (especially if you made it), could you unplug the box (kill it)?