>superseded by stronger emphasis on peace

I think that this is largely true, in the rather left-wing Catholic schools of my youth (sadly, maybe not so left-wing these days), we sang very few of the old standards like "Onward Christian Soldiers" and many more of the modern hymns/songs like "Morning has Broken". We were much more interested in learning about the liberation theologies of Latin America, world religions and trying to make a positive contribution to world poverty (although population control was always a tricky discussion). I'm sure there's another place to discuss all this stuff but I agree, let the world focus on building peace not harping back to war.