" ... citizens of countries with student and exchange visitor visa overstay rates exceeding 10 percent would only be eligible for two-year visas with the possib

" ... citizens of countries with student and exchange visitor visa overstay rates exceeding 10 percent would only be eligible for two-year visas with the possibility for renewal" Why should the overstay rate inform the duration of a visa? I can understand it playing a part in whether a visa is issued or not. But if someone is going to overstay, a 1-day visa is also sufficient for them to overstay indefinitely.