Given the obvious seriousness of the situation, we can take it in a good faith that Scotty wasn't screwing around but serious and correct when he stated "No question, Their power is simple impulse."
Serious we can bet on. Correct doesn't follow.
Whatever facts he based his conclusion upon, these remain objectively unknown to you.
And to you as well. So claiming that Scotty was right is just as "objectively" baseless as claiming he was wrong. Getting upset about the possibility that the heroes could screw up is a bit 1960s TV, now isn't it?
But yeah, let's drop the subject. Given how haphazardly the episode was thrown together, it's not going to get sorted out with just half a century of speculation...