I'm the same as far as Low In High School is concerned. I don't really think it's a strong album by any means, far too patchy and the track order is just weird, but I played it so often (and still do) that I definitely developed a strange fondness for it.
All The Young People Must Fall In Love used to be one of my least favourite tracks on it though, probably because the placing on the second side doesn't work for me. I've got used to it now, it's quite all right and enjoyable when isolated from the rest of the album, although lyrically I only really like the first verse and the "To watch or to be, that's up to you" bit.
Agree about the protest song vibe and I think the contrasting of the lyrics with the happy bob-along music is intentional. Who else but Morrissey could away with singing a line like "Incinerate innocent men and women and children" in such a cheerful way?
I think the general gist of the song is that it doesn't really matter what's going on in the world today, it's always the same anyway and falling in love is much more exciting and young people have the luxury of being able to live in the moment.
The humming really is the highlight, sounds so warm and full.
The single cover is great, especially in combination with the back cover.
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I don't think any of the more recent single covers were terrible, to be honest. Just the album art for the original LIHS, California Son and IANADOAC were. One tends to forget that the most horrific visual abominations were only posted on Central and never actually made it on any release.