There's an interesting little "AV Club" interview with the great Jack Davis in connection with a recent retrospective/bio book release that can be found
here.
Now, I know that "Foul Play" was a somewhat questionable story to put out, but I really don't think it had a direct influence on the "ruining of the American youth" (whatever that means). Although I can understand Davis' distancing of himself from the work... after all, what it did have a direct influence on at the time was his address. I recall reading somewhere that he actually had moved a few times due to the controversy surrounding it.
He seems also to regret most of his other EC horror work... honestly, I wouldn't... I don't see much reason to do so.