No marriage, then no IRS category for ‘Married, filing jointly’ - so now each couple gets to file their own tax form; and can pay more tax. No marriage, no exemptions -
With the money give-away program the Gov’t has launched on; they need to finance this in some way.
“...and can pay more tax.”
In my case, less tax. Two incomes puts a lot of it into the high bracket. It’s why there’s a whole separate table for ‘married filing separately’. It’s higher than the individual rates.
I think you need to study up on tax law. Google “marriage penalty” to start with. Then think about how many elderly widows and widowers can’t marry without devastating financial consequences, due to government edicts about the distribution of both pension and Social Security benefits.