But without religion, how would people justify genocidal war
I know, I know, there's already a backup list of other things...
Maybe we could have wars about spaces or tabs instead of "holy" land?
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The justification is irrelevant.
Wars are started when someone thinks he can win something by starting it (money, political power, lands...). Or when there is such a lack of trust between the parts that any kind of conflict tends to grow, instead of shrink.
Everything else are lame excuses.
