I get upset too because as someone who is highly myopic and so has to wear contact lenses or glasses every waking minute...I know I'd be screwed in a post-apocalyptic world. So I wince with sympathy when someone's glasses are destroyed.

I always hated that scene in The Mummy where one of the explorers crunches his own glasses until my mum pointed out that Imhotep was taking someone's short-sighted eyes and "what use is that?" Then it became sort of funny after that! But I still don't really like it.