I dunno, I hated that long before MOS. I think the neck-snap was a horrific miscalculation, but only due to the symbolism involved; Superman in II, just plain murdering three powerless, helpless individuals in 100% cold blood, is insanely worse. You can talk about him 'doing what he has to' all you want, there is no interpretation of his actions where he isn't behaving abhorrently.