In the US a majority of your taxes go to federal and state governments, whether you live in the city or the suburbs doesn't change where your taxes go and how much you're paying. The cost of living difference in that case is based on micro-economic supply and demand cost differences.

Companies moving to Ireland IMO are definitely exploiting tax loop holes and committing fraud. You and I and all of the countries devoid of tax revenue are hurt by companies benefiting from tax-avoidance loop holes.