This probably seems like a very random read, and I suppose it is. I was working on something recently and ended up reading or rereading a few dozen fairy tales.
This one is very short compared to many, and simple rather than complicated - at least at a glance. I had to think for a few minutes what the point of this story was. The problem was that I initially tried thinking from the perspective of the titular billy goats. There was no lesson to be learned from their side of the story, and honestly, they seemed like conniving and back-stabbing animals. From the troll's perspective, the lesson suddenly became clear: Don't be greedy. Similar to the saying "A bird in hand is better than two in the brush."
When I looked online, I was genuinely surprised to see that most readers seemed to think this was a story about working together to overcome problems. Wait, what? Oh, it's because the smaller goats had to trick the troll and rely on the bigger goat to help them. No, that doesn't work for me. Because if the big goat could handle the problem, why didn't he lead the way? He could have even stood on the bridge while the smaller goats crossed, protecting them like a goat crossing guard.
This strange story seems to benefit more from the trip trap sound effects for a younger audience than the message, as many people seem to come away from the story somehow thinking about how smart the goats were. Of course, I prefer the Grimm's version, where the 3rd billy goat put out the troll's eyes with its horns and crushed its body and bones with its hooves before throwing the corpse off the bridge.