It was incorrect, but they were basing their beliefs on our actions. Yes, they did believe that we might launch a preemptive attack, but isn't that exactly what our own and western European media and "intelligentsia" was saying as well? That Reagan was a cowboy?
Mutual misinterpretations, and the Archer op was unwise. See above (28).
But the Soviets had more of a history that warranted the lesser trust and fostered Regan’s warnings, and i doubt that if the Soviets were not opposed by us then they would have gone about conquering the world.