It truly is, on a basic level, difficult to watch any airplane be destroyed intentionally. Especially so when it is done in such an apparenty calous and brutal manner. Not as bad as, say, watching a crash. But if you consider it on an intellectual level it makes perfect sense to use these aircraft productively, rather than to have them just sit out in the desert forever. Recycling is a good thing for any product that has come to the end of it's useful life. But on a visceral level? That's another thing all together.
LA