I am so glad you went here.
Nobody is asking you to lend me a stamp. You’re taking a social contract one that we both have with an otherwise neutral third party and making it one between you and I suddenly. It isn’t. Millions and millions of people comprise the postal system. An example where you personally buy someone else some stamps… well heck, (and allow me for the sake of rhetoric only make an equally absurd counter argument: why not just ask why you have to buy poor kids free school lunch when you don’t even have kids?)
The post. Education, Highways. Broadcast airwaves.
These are things supported by, regulated by, and in some part paid for by us all collectively. We do not get more access to because we pay more in taxes, in America. (and where we do, look at who defends that). We’re not (supposed to be) that selfish, we agreed to promote the common welfare and lower barriers to access.
The internet is, arguably, as useful a technology as the invention of the road. You don’t have to get anyone a ferrari, but yeah, a fleet of Tata’s isn’t actually going to cost us all that much. Consider it.