Saying “troll and harass” doesn’t really do the subject justice. I would rather describe it with the words “manipulate and influence.”
When do you think the manipulation started? It’s certainly not a new concept. It’s inherently human.
It has just evolved in modern times to use the Internet as a tool, but it’s always been happening.
Occams razor most certainly applies here. It doesn’t just apply to foreign governments but also all the nefarious factions around the world.
The evidence is all around you, psyops everywhere.
It’s worth acknowledging when you’re artificially pinging your dopamine system. When you eat tasty food, when you drink coffee, when you smoke weed. Stimulating yourself by browsing the Internet aimlessly falls into this category too.