Why does plat+ players build Varus as they do?

I agree whit them that {{item:3153}} is mandatory as first item. I feel that {{item:3124}} is allmost mandatoy as second item because of its synergy whit {{item:3153}} and hes passive. They build {{item:3031}} or {{item:3046}} instead (we agree on that he needs {{item:3085}}) sure these will do a lot of damage but i would play {{champion:22}} and {{champion:222}} if i want to build these items. Why is {{item:3124}} a bad choice as second item?
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