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The thinking became so martially influenced that nothing else mattered except martial matters which led to a shrinking population from warfare and separation of the sexes. They self destructed due to their own philosophy.
The bubonic plague imacted religion and spirituality in the years after its outbreak as per answer ( B ): The Church grew weaker beacuse many people began to lose faith in God after witnessing the massive death tolls of the plague. A common reaction was to incur in sin, arguing that everyone was to horribly die regardless.