[robertpaulsen]

"If the crimes in question would have dropped regardless of the increase in porn consumption, then porn has nothing to do with these crimes, does it?"

We do not know how much more it would have dropped had porn not increased.

[Junior]

And since we don't, you cannot claim that porn has slowed its decline.

[malakhi]

We do not know how much more it would have dropped had porn not increased.

"We do not know how much more our students' test scores would increase, if only we would spend more money on public education."

See any similarity in the statements?