People without kids should have to pay more social security tax

Social Security works by taxing workers in order to distribute benefits to retired persons.

The working population relative to the retired population has been decreasing due to declining birth rates.

The system's insolvency is a result of benefits paid being greater than revenue generated, and the revenue is a product of tax rate and the number of workers.

People who have kids contribute to the solvency of the program by creating additional workers. These people take on the additional cost of raising kids.

Childless adults should be required to pay more FICA tax because they are undermining the system by not producing a future generation of workers/tax payers.