It explains a lot. The engineer in his allegory doesn't like balloons. Stephen Woodworth doesn't like abortion.
The engineer in his allegory can't convince anyone to outlaw balloons. (Maybe that's because, at least in the allegory, not a single argument against balloons was offered.) So he tries an end-run around the issue by suggesting a bogus study of "aviation principles".
Then, despite his irrational hatred of balloons, the engineer is surprised that people see through his ploy and "accuse the aviation engineer of being a ballooning-hater whose only motive was to destroy the ballooning industry". Well, in the allegory, that was true, wasn't it? In the first paragraph, we learned that "He actively spoke and wrote against ballooning, penning letters to the editor and articles in professional journals to express this opposition to ballooning." So these accusations are perfectly justified, aren't they?
That allegory doesn't mean what Woodworth thinks it means. Somebody's full of hot hair.