The thing with football is that there isn't the line of demarcation that baseball has.
Yes, we all can remember when 300 pounds was huge for a lineman. But that came upon gradually, rather than an explosion. And, linemen aren't breaking records that have held up from the '30s. Combine that with the fact with A) most tv audiences don't focus on lineplay as such, b) there aren't too many hallowed stats with lineman, c) the other side is doing it too. So on tv, it plays different in my mind, because there isn't that singular moment of the ball leaving the field, and the defense can directly stop you in football, so it evens out in some ways.
And yes, the other sports have long tried to curtail it, and if someone gets busted, they aren't slapped on the wrist.
As far as Congress goes, say what you will, but just because there are sometimes bigger fish to fry doesn't mean they have to abdicate their right to legislate the LAW.
There is always going to be a bigger issue at any given time. Government can't completely solve the #1 issue, then move on to #2, and so on. They are allowed to look at the gamut of issues. And say what you will (And I will, I think adults should be allowed to use steroids if they desire), it is setting a bad example for kids. Now, I am not one who buys the "what about the children" everytime something bad comes along, but its not as if reigning in prominent lawbreakers is some craven enterprise.