"they're just subsidizing themselves" -> they are spending money that they wouldn't choose to spend if they had fine grained control over the taxes they paid.
You pay health insurance so you don't have to pay the full cost later on. And it could easily be that the shipping cost + taxes generally means that the system stays afloat. And besides, if you tax correctly, it wouldn't be the same rate for everyone (income taxes should be higher for those making more, for example) nor would it be more than the flat shipping costs so long as the tax money actually went to the postal service.
In both cases, are the employees getting paid fair wages?
Does the tax mean I'm not getting charged for receiving packages? Are there hidden costs to the lower amount?
When you buy health insurance you pay more than the expected value of the full cost, both as a result of the cost of providing the insurance and the over-consumption as a result of insurance making patients price insensitive.
The reason you buy insurance is in case your medical bills are more than average and you can't afford them. For the average person the insurance is a net loss but the cost savings of not having it aren't worth the risk.
> And it could easily be that the shipping cost + taxes generally means that the system stays afloat.
If the system is worth more than it costs then it will be able to charge prices that allow it to stay afloat. We generally don't need systems that cost more than they're worth.
> And besides, if you tax correctly, it wouldn't be the same rate for everyone (income taxes should be higher for those making more, for example) nor would it be more than the flat shipping costs so long as the tax money actually went to the postal service.
Everybody always wants somebody else to pay for it. But it's the people in the middle and not at the top who actually pay for stuff, because they're the only ones numerous enough to do it.
> In both cases, are the employees getting paid fair wages?
That sounds like a question for the employees and not the customers. Naturally if they're getting paid below market rates they should consider seeking other employment.
> Does the tax mean I'm not getting charged for receiving packages?
You can already get charged for receiving packages. It's called COD. Nobody really uses it because it's much more convenient to charge up front than have the carrier try to collect payment from the recipient.
In some countries without mandatory health insurance, medical cost is a lot lower and simpler. If major medical emergency happens, then families usually need to take out a loan. But for regular medical issues, you save for it. This includes issues like childbirth which in America very few people can afford without insurance.
I imagine, having health or car insurances gives some sense of false security, which leads to poor lifestyle choices or driving fast, which in turn causes one to experience bad health or accidents, thus using their insurance. Which causes insurance rates to rise. And one is not directly negotiating with hospital or bodyshop, those prices rises too.
... And the system is more efficient because of standardization and pooling money together.
The US system doesn't have much of any standardization, and in general has a lot more facilities than it might otherwise need - plus things like some of the government provided insurance not paying enough and not having the ability to act like public insurances. These all make it more expensive. Heck, even standardizing insurance coding would help.
It is cruel to expect folks to take out a loan for medical emergencies. In some places, you die if you can't pay. It isn't like health is completely under your control: Type I diabetics couldn't prevent it (for example). Many cancers can't be avoided. And so on.
Negotiating with medical facilities is a pipe dream. There are many cases where you simply don't have the choice (emergency) nor the mental space to do it (for example, do you know how to judge what facilities are better for a gall bladdar removal surgery? How about where to get cancer treatment? How does one judge any of that?)
Does care insurance cause you to drive fast? Seriously? Isn't that more cultural than whether or not you have insurance?