D&C 86 says that the “tares” aren’t rooted up because the faith of the “wheat” is weak.

For a long time I have lightly entertained the notion that the date of the Second Coming is variable. I speculated our righteousness can put it off, just like Sodom could have been saved if there were even 10 righteous people there.

But this section says the opposite. It says it is the feebleness of our righteousness that keeps putting off the Second Coming.

Model: the situation keeps getting worse until no one with weak faith is left one way or the other.

Wryly, one might say The beatings will continue until faith improves.