David Gilmour says it's about the fall of Communism, with metaphorical applications to the topic of personal relationships (but nothing to do with Roger).

I'd be interested to hear your theory as well.

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what do you teach your children about me?
what do you teach your little children about me?
pimp, thug, bling drug lord of the undergrounded kings
how can you be so sure i won't call down the rain?
what do you teach your little children about me?
you point your gun, wait, hide and run. i see it plain