The attack comes on several levels, all of which are dependent on having at least some website/newsite which is willing to repeat your claims.
Your audience can be broken into 3 buckets (several more, but 3 is enough for a demonstration)
1) The first bucket is non-experts but intelligent. Tie them down in various plausible sounding arguments, primarily designed to appeal to people who dont't know the subject, but can make out logical sounding arguments. These people become your rank and file who serve to sound convincing and tie up experts
2) Experts - With your rank and file, tie up all people who know the subject, or increasingly develop methods to keep them distant from actual contact with people. Over simplify their arguments and try and engage Experts in the arena of PR.
3) Everyone else - show that experts are out of touch, or just lie, advertise the benefits and leave out the risks. Point out that experts are currently in debate and cant settle on the benefits (thanks to your hard work).
The general 3 steps to spreading FUD
But I think we should try to remember and go back to the fact that essentially nobody likes what the ISPs want to do at all. If we could find a more agreeable way to address it and not let it get twisted to further other agendas, I think most people could agree that it needs to be stopped.
This is dealt with by PR, advertising and focus groups.
Then it became some kind of political football and people were divided up on how to respond to it.