The Internet is a bunch of interconnected networks. Any of those networks can largely have whatever conditions they want. That is what the Internet is. Do I think it should be different, yes, but a lot of people don't. Especially those arguing against things like throttling.
No, it's not like that at all. UPS makes it clear to the customer in advance what the cost is, how long it will take, and the customer agrees. Also, UPS is not held responsible for delays that they couldn't reasonably prevent (bad weather, etc).
It's also an exaggeration of the situation; it's essentially saying "If we can't achieve perfection, then we might as well not have any standards and we can't hold anyone accountable for anything." The fact is that those speeds are obtainable in most of the common situations that people actually need them, and the throttling only occurs out of unwillingness on the part of ISPs to negotiate agreements that would allow those speeds; it's greed and/or laziness, not physical or technical limitations.
At the end of the day what you are describing is some sort of regulated nationalized Internet backbone. Which would to a larger extent support such features. As it is now if you don't like the "mix" of access you are getting, you should change providers (which could of course be a problem, but that is another issue).