However I can also see it leading to an author being more able to spread disinformation and removing all critical comments making it seem legitimate.

That's one side of the medal. On the other hand I see many flags given just because of different opinions, personal animosities or even for fun.

Maybe a committee of elected users with some delegated Steem power from Steemit, Inc. might help, which could decide (in case someone complains) if flags are justified or not, and if "yes" just counter them with upvotes.
In addition, accounts who repeatedly misuse flags in an abusive way (instead using them against spam, plagiarism etc.) could be flagged, as well, after a decision of that committee.

If abusive flags could be countered like that, I would agree not to take further measures to protect the blog or an author.