That's how I see. As a society we need to decide if encouraging people to have children by setting up parent friendly policies is important. I feel it is given the same reasons you gave and thus am in a proponent of those policies. Claiming they are unjust to people without kids ignores in my opinion the societal need to keep a good replenishment rate of our population to support older generations and keep the working population large to support everything from infrastructure to social services funded.

Another option is immigration which has its own pro cons.