The submission queue is designed to let the majority decide what stories get posted. Or does it?
An extreme scenario
Let's not forget that free email accounts are
extremely easy to obtain. In fact, if you run an SMTP domain, you can create a hundred, a thousand, a million aliases, all of which correspond to a unique email address. This immediately entitles you to an equivalent number of K5 accounts.
"Oh," you say. "Why would anyone waste their time to do such a thing?" Let's forget about the "why" for a minute, and consider the who. Who would do such a thing? Certainly not the more reputable users of the site. Certainly not those who genuinely want to participate and contribute. The unfortunate answer is, it is those who want to be destructive. It is precisely those we don't want to deal with, who ultimately has the time and effort to put into such a thing.
OK, you say. Rusty can just delete all those accounts immediately. Sure. It may be hard if this destructive person is able to create email accounts with several different domains, but still possible.
A plausible scenario
But consider now a less extreme scenario: that a certain population among K5er's (let's call it X) decides they want to sign up for multiple accounts. You don't have to go very far -- each person in X only needs to get one extra account (i.e. they have two accounts each). I'm sure this is already happening to an extent; but suppose X represents a significant percentage of K5. Suppose further that each person in X decides to vote with both accounts.
Now suddenly, population X has obtained double power -- they get two votes per story, and they get to rate each comment twice. This is now much harder to fix -- because it's not one person with many accounts, but many people each with a few accounts. And this tips the balance of the voting system used in the submission queue -- it no longer represents what the majority wants, but is heavily skewed towards what population X wants.
Furthermore, since this could potentially be quite unnoticeable, the views and opinions expressed on K5 could be subtly tilted towards a particularly viewpoint which is not representative of its true population.
Again, let's consider who are the most likely to do such a thing. What would population X look like? Again, the answer is: those with too much time on their hands, those who have a grudge (and therefore the motivation to go through the trouble of doing something like this), and those who think it's fun to be destructive. In short, those whom we don't want to have this unfair voting advantage.
Root of the problem
The root of the problem is that an email address is ultimately unaccountable. A bunch of email accounts could all be different people, or could be one person, and checking for this is a job that no one (least of all Rusty) wants to do.
After all, censorship isn't something this site wants, is it?
There must be a way to prevent this scenario from happening. Unfortunately, that may probably involve personal information that I doubt anyone on this site would be willing to give.
Grain of Salt
Finally, the upshot of all this is, please don't take this site too seriously. You're probably getting a heavily colored view of things. If you base your philosophy on the debates that go on here, well ... you have my deepest sympathies.