WHO DOES have the capability or knowledge? Rank and file members? Returned missionaries? Bishops? Stake Presidents?
Does not your post, in effect say to the members who are "not in the know" that it perfectly acceptable to "Lie for the Lord" because you can't always spew the church-approved answers"?
Also, why are these missionaries sent out without the requisite knowledge? They are the "face of the church" to the contacts they make. Are there so MANY contradictory teachings in LDS doctrine that they can't be prepared beforehand?
Ask the scholars at FARMS, FAIR, or another LDS apologist. There are hundreds, if not thousands - just Google some.
No, I do not believe we should “lie for the Lord” and neither did Bro Millet say that in the video on YouTube. All he did was advocate the biblical teaching of giving milk before meat.
As for why missionaries are so unprepared, what do you expect from ordinary young members? They are taught the basics during two and a half weeks in the MTC (8 weeks if they have to learn a new language) and then sent out into the mission field. They are NOT going to devote their lives in a ministry. They are only serving for 1.5 to 2 years. If they are to be properly trained, they will have to study in a comparable manner to how ministers are trained in other faiths, and how long will that take? Anywhere from 4-9 years.
Sorry, much as I don’t like it, the LDS church doesn’t operate like that.