The initial comment's argument is comparing "misinformation" with "pollution", since misinformation can now be massively broadcast to many people through the internet, causing ill effects.

The problem is differentiating between "information" and "misinformation" - which is exactly the issue of truth and lies, isn't it?

Otherwise, if you ignore the truthfulness of information, and judge only by the effects, you're walking a slippery slope towards censoring truth because "it's harmful".