> I think we can both agree there is a fundamental difference between someone impersonating a cop (who has wide discretion to order people to stop, detain them, search them or interrogate them) and someone dressing up like a letter carrier.
I don't agree on any specific difference between dressing up and impersonating in general, as I'm not sure how you are defining the difference, but to my mind impersonation is likely hard to prove, and if the desire is to stop the behavior, preventing dressing up is a useful way to make sure the law is enforcable.
I do agree there is a difference in importance between impersonating a police officer and impersonating a mail carrier, but in both cases I think the base reason is the same. To keep specific expectations and abilities granted to the individual as a government employee from being abused by others.
> Second, it is already illegal to forge correspondence correspondence from the IRS. Why make people who, for whatever reason, want to dress up like Cliff Clavin subject to six months in federal prison? Similarly, I agree mail fraud is real and one can abuse the mail for nefarious means, however again mail fraud is illegal and, in respect to your example, mailing anthrax the people is also already illegal.
Because if something is routed through the mail system we have a record of it, and information regarding it's origin. If someone dresses up as a mail carrier and puts it in your mailbox, not only is that record lost, but likely nobody around will pay any attention. Some random person putting something in your mailbox may attract attention, if only because those around might think they are trying to steal mail. Which takes us to stealing mail It's harder to steal mail when you have no business in anyone else's mailbox because it's illegal. Neighbors seeing a stranger rifling through a mailbox may be likely to call thge person out or even call the police. Preventing people from impersonating a mail carrier is very useful here.
It's worth noting that other carrier services are legally prevented from using your mailbox. Your mailbox/mail slot is considered federal property. There is thus a chain of custody when things are shipped through USPS, unless someone breaks the law.
> I suppose the problem I'm trying to highlight here is a tendency for government, at times, to create laws that are, at best, silly, and, more often, harmfully over-broad in short-sighted attempts to stop behavior that is (or can be) readily addressed by existing laws. It can lead to harmful side effects.
Sure, those exist. I don't think this is a good case of that.