Justice Kennedy argued that Congress had created a substantive leave-benefit program, not a congruent and proportional remedy for demonstrated constitutional violations by the States. Although Congress clearly invoked § 5 and could regulate leave under the Commerce Clause, it could not expose nonconsenting States to private damages suits without a documented pattern of unconstitutional state conduct and a suitably tailored remedy.
The relevant constitutional question was whether States had engaged in widespread intentional gender discrimination in granting family-care leave, not whether women had historically suffered employment discrimination generally. The evidence cited by the Court largely concerned private employers, parenting leave rather than care for an ill relative, or federal employment practices. In Kennedy's view, those materials did not establish a pattern of unconstitutional discrimination by state employers in administering the precise family-care benefit at issue.
Kennedy also emphasized that many States had adopted family-leave programs before the FMLA. Some programs may have been incomplete, discretionary, or less generous than Congress preferred, but those features did not themselves prove intentional sex discrimination. Nor did constitutionally permissible pregnancy-disability leave for women establish unlawful discrimination against men in family-care leave.
A remedy tailored to any proven discrimination would require States to administer whatever leave benefits they offered on equal terms for men and women. Instead, the FMLA imposed a universal minimum of 12 weeks of leave, even though the Constitution does not require States to offer family leave at all. The statute therefore displaced state policy choices rather than enforcing a constitutional equality guarantee.
Individuals would still have remedies if the Court rejected damages actions against States: the FMLA could bind States under the Commerce Clause, the United States could enforce it, and private plaintiffs could seek prospective injunctive relief against state officials under Ex parte Young. The issue was only whether private plaintiffs could obtain money from state treasuries, and Kennedy concluded that Congress lacked sufficient § 5 authority to authorize that result.