The bugs indicate that the moisture is an ongoing issue in your basement. They lay their eggs in soil or organic debris, so they're either coming in the same way the water does or there's something such as paper or cardboard or potting soil that stays damp down there. Killing them off on the stairs might keep them out of the living area, and it definitely is cheaper than waterproofing, but moisture can cause other problems including wood rot, termites, carpenter ants, mold, mildew, etc. It's your choice.
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