Because we've set a precedent for meddling/policing for over a century, and to stop now would be certain death to the current political party via a media assault.

Our two party (err, one party) system is set up to preserve the status quo in its entirety. To not do so is certain death, politically.

While I agree with you that the US government has overstepped its bounds for too long and they should not be policing anything but their own arrogance, it is inevitable for our government to have to do some sort of ridiculous posturing over this.