I came across an article, An image from Francis Hutcheson in Gulliver’s Travels, book IV, chapter 5 by Arnd Bohm, in which he points out the similarity between a passage by Swift and a passage by Hutcheson.
In Gulliver’s Travels (book IV, Chapter 5) Gulliver tells the gentle, horse-like Houyhnhnm master about wars among humans, and the death and destruction it involves:
And to set forth the valour of my own dear countrymen, I assured him, “that I had seen them blow up a hundred enemies at once in a siege, and as many in a ship, and beheld the dead bodies drop down in pieces from the clouds, to the great diversion of the spectators.”
The Houyhnhnm is horrified, as we might be well be, at the thought of wholesale death being a “great diversion”. Bohm suggests that the moral indifference shown is emphasised when we realise the likely source of the example Swift is using.