In the interests of full disclosure, the above bullet statement, "If you're an apostate, chances are bad conduct/secret sin/moral depravity made you that way. Apostasy is usually founded on sin and rarely on conviction," is my summary based on my total impression of Mr. Lett's comments. Here's what he actually said:
See, Jehovah's not going to lower his standard to accommodate us, is he? We have to come up to Jehovah's standard, and this book [Keep Yourselves in God's Love] will help us do that. And it will help us to maintain that high standard. 'Cause you remember the comment was made in the talk that when someone makes the sad mistake of leaving Jehovah's love, remember the problem is not usually doctrine, it's conduct, isn't it? So this book is going to help ones to maintain that high standard that Jehovah has set in conduct.