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Why is it seen as an obvious truth that we should allow every single person onto the Internet, without ever being able to remove them?...Because it is obvious. Everyone should be able to access the internet.
Now, do the various internet communities have a right to ban people they don't want around? Yes. Absolutely.
However, that's not "gate keeping", it's more accurately called Freedom of Association and the government is implicitly restricted from denying you such freedom via the First. (Provided you are in the US.) And, yes, Freedom of Association is wonderful. That's why we're not subjected to child porn, or nut jobs gunning down little old jewish and black ladies at worship, or 7 year old girls being disemboweled. Etc etc etc. If those people want to share their content, they can, they just need to do it in their own community where the rest of us don't have to see it. Because they are, mercifully for the rest of us, generally banned from our general communities.
I guess I'm just hoping that what you meant was that people should be able to remove others from their community. Not that people should be able to remove others from the internet. (Although a lot of that stuff, I mean, I wouldn't lose any sleep if it became unavailable tomorrow. I'd probably cheer in fact.)