At least for my six-year old son.
When he first spied one of the chubby 3-inch long hornworms among the tomato foliage, he recoiled in horror.
Horror gradually turned to cautious fascination as he helped me find several other hornworms that were feasting on my plant.
Five minutes later he was plucking them off by hand, studying them, getting to know them as individuals, naming them things like “Mr. Chewie” and “Spike”.
Then he happily ushered them into the Lepidoptera Afterlife by submerging them in tub of soapy water.