However, > pay no taxes, vehicle license fees, parking fines
These all make perfect sense to me. How __else__ do you expect mail to be delivered even moderately efficiently?
> government monopoly
Only on first-class mail, first of all. Second of all, if you read tfa you'd realize that a mandate for maintaining a government-run post office is literally in the damn constitution. Are you also upset that there are government monopolies on the judiciary and declaring war?
edit: formatting