In comments from 2021 that resurfaced last week, Sen. J.D. Vance (R–Ohio) said that childless Americans ought to pay higher taxes than those who have kids. “If you’re making $100,000 [or] $400,000 a year, and you’ve got three kids, you should pay a different, lower tax rate than if you’re making the same amount of money and you don’t have kids,” Vance said back then, during an interview with conservative activist and podcaster Charlie Kirk. Here’s the good news for Vance: It’s already true that childless Americans pay higher taxes than most of those who reproduce. That was true in 2021, and it…