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A non-industrial country does not prevent an industrial country from successful industry, therefore the industrial country is unjustified in invading the non-industrial country. A non-compulsory-schooling country does not prevent a compulsory-schooling scountry from successful compulsory schooling, therefore the compulsory-schooling country is unjustified in invading the non-compulsory-schooling country. And so on. (In fact it is the other way round: the non-industrial/non-compulsory-schooling/etc. countries should invade the industrial/compulsory-schooling/etc. countries in order to eradicate industry/compulsory schooling/etc.!)In general, let X be an idea. If X is something that can succeed only if everyone practices it, invasion to impose X is justified. Whereas if X is something that can succeed with merely a fraction of people practicing it, invasion to spread X is unjustified (but invasion of practitioners by non-practitioners to eradicate X is justified!).