Anyone who argues that USPS is a "waste of money" is either grossly misinformed or lying through one's teeth; USPS is self-funded through postage and other fees, not through taxpayer funding. You still have to pay for postage to mail a potato.
If you could opt out of having a mailbox and use email for police and government correspondence then it wouldn’t be so offensive, but as far as I know you are practically required to maintain a hole where they can shove their ad spam.