I guess it depends how you fund the system then. If there are not 'profits', how would additional infrastructure and upkeep be done, without just raising rates higher to pay for it? And who would loan them the money? The government? Oh, so back to taxpayers.
"Taxpayers" are the public.
The infrastructure is for the public.
Why shouldn't the public get to pay for its own infrastructure without a middleman trying to make a buck?
Huh? Profits are outside capital improvements. That is the nature of profits. There are arguments for private utilities but this one makes no sense.
How are roads maintained and upgraded?