Well perhaps Woulhuter was talking about the American collegiate scene in the '70's and perhaps we shouldn't presume that it was as prevalent throughout the rest of the world?
Yes, I'm sure a fair few sprinters and athletes involved with power based field events were taking steroids in the '70's and '80's; and it's now pretty much certain that many GDR athletes were on state sponsored programmes; but I doubt many middle distance runners in the '70's and '80's were taking anything. Steroids aren't going to do a great deal for a 1500m runner, and Coe's frame hardly fits in with the pattern of what happens physically to someone on steroids.
Yes, Coe was almost 2 secs faster than anyone else for 3 years, and should have run faster than he did over 1500m, but that is because of a variety of factors. Coe had a long career and one which entailed many missed opportunities due to illness and injuries. If he'd been on drugs surely he would have made much quicker recoveries? I can think of many careers that seemed to go without any injuries whatsoever, which to me is much more suspicious. Coe was running 1:43 at 21 and still running 1:43 at 33. The longevity of the levels he achieved doesn't really fit in with the characteristics of a drug abuser. And believe me, if there was even a whiff of foul play the British press would have got hold of it some time ago, especially considering his subsequent political profile.
It is truly bizarre that people today with little knowledge of a long gone period in sport are quick to dismiss a performance (or rather a series of performances, as he wasn't just a 1 trick pony) of knocking 1.7 secs off the World record (in an event which had seen little development in the previous 15 years or so and was due a progression) at 800m, but totally disregard a 45 sec WR improvement in a longer event in less than 10 years, during a decade when EPO was around and completely undetectable. By your argument then perhaps Jim Ryan was taking something when he improved the 1500m and Mile records by 2.5secs? That was, after all in the sixties.
And someone whose 2000m and 2 miles pbs are on a par with Ovett but who has only managed to run 800m in 1:46 can run 1500m in 3:26!? Please.
Sorry, but there are a lot of other athletes whose careers and performances hint at drug use a lot more than Coe's. I would suggest that drug use among MIDDLE distance runners at top international level was far higher in the late 90's/early '00's than during the '70's and '80's.