I wasn't commenting so much on the sin itself but on the propensity to continue in the sin, and repeat it.
At last count, Hal is on wife number 4. It's difficult to think that the first three Mrs. Lindseys were all guilty of adultery or desertion against poor Hal.
The way Christians deal with sin is through repentance and forgiveness by the garace of Christ. Hal seems to have skipped the first part of that and tried to go right to the second, counting on the suckers listening to him on TV and reading his books and web site.
Christians turn away from sin. Public figures, especially those who profess to be teachers in the church, are particularly culpable. "My brethren, let not many of you become teachers, knowing that we shall receive a stricter judgment." (James 3:1)
It think this is an example of what the theologists call "cheap grace".
Most of our sins are not public. The other guy's sin always looks worse than our own.
Let him who is without sin cast the next stone.
It appears that we are expected to understand that the poster of said assaults on Hal is lily white in terms of never repeateing any sin more than once.
Therefore the seemingly many buckets of rocks have the Heavenly seal of approval for vigorous throwing.
However, I'm exceedingly skeptical that said appearances are the least bit true.