When the aids epidemic was on its early growth curve, the conventional wisdom accepted by everyone, was that it only affected perverted homosexuals and Carribean immigrants. In fact there was a joke that said the most difficult part of having aids was telling your parents you're a Haatian. Substitute Texas in place of Haati and you have a similar arguement now. From a Texas post:
The day the Mitchell report was released, the local news in the DC metro area interviewed a high school senior baseball player from our community. It was pretty common knowledge that his brother had killed himself. What wasn't common knowledge was that the brother was taking steroids. In the interview, the baseball player attributed the death of his brother directly to the effects of steroids. Do you think that no one other than the one taking the steroids was hurt?
Do I know for a fact that the number is 300,000? No. Nor do I think it really matters.