“Bible Teach,” Chapter 11, paragraphs 18-20 (pp. 113-114) asks why God couldn’t have created Adam and Eve in such a way that they couldn’t rebel. The Watchtower’s answer is that God didn’t want us to be robots. He would rather have love than compulsion.
You can respond with points I made in The Righteousness Approach from my book, Getting Through to Jehovah’s Witnesses: Approaching Bible Discussions in Unexpected Ways, pp. 70-71, regarding the Watchtower’s teaching about the coming millennial kingdom.

Imagine for a moment that you owe someone a staggering amount of money—let’s say a billion dollars. There is no way that you would ever be able to pay it off. In order for you to be rescued from this predicament, a very wealthy and generous person would have to pay it for you.