Disinformation/narratives' control has always been present:

There are some examples I can think of:

  - Manifest Destiny.
  - Spanish American 1989 war because (Maine sinking).
  - The gulf of Tokin incident.
  - The Nayirah testimony.
  - Irak's WMD.

I think the issue here is that the some western governments are failing to control information, and their citizens are now being preyed by other governments' disinformation campaigns (Russia, China).

Does this worries me? Yes, of course. The level of fracture in some societies (USA, UK, for example) is increasing. How could we enact some defenses against them? Don't know.