True -- and very convenient.
We also have no way of knowing how many lives were saved due to govt regulations from the FDA, EPA, OHSA, etc. We have no way of knowing how much dumber kids would be without public schools. With every law and regulation, with every spending, you can say, "But we have no way of knowing how much worse it could have been without it."
Increasingly, I see "conservatives" adopt liberal reasoning.
To my remark, "We have no way of knowing all the failed attempts that have been made since then." you wrote,"True -- and very convenient." I say, "true any very correct!!". How could we?
Regarding your comment, "Increasingly, I see "conservatives" adopt liberal reasoning".There's not much that I agree with the liberals about, but their more conservative choices, and our more liberal ones, probabily do mesh at some point.