Tax incentives benefit a company long term, that is the outlook of a CFO and CEOs.
Same like Tax Incentives, labor cost, land cost and factory cost is very less when no one is around. Since Elon Musk has long term vision of producing cheap, he has envisioned Reno for that.
The current issues are temporary and soon Tesla will get away from it.
The factory cost savings and tax savings will reflect long term benefit.