What you're effectively saying is that contributions to Wikipedia should be reserved for people who are highly involved with Wikipedia already. Outsider? No chance. Why allow every peasant to add stuff, right?.

I derive this assumption from your statement that his contribution, effort and attitude was "wrong", "minimal", and "poisonous". I don't see any of that. I see a rant following a genuine effort to contribute, a contribution worth considering, and an attitude that started off with the best intent but got punched down in the process. Who wouldn't turn sour after such an experience? It's called cause and effect. Of couse you'll be pissed if something as ludicrous as this happens to you.

Unless you're so caught up in your little world of the 'inner circle' that you don't tolerate outsiders. Unfortunately, that's not how the world works. That's also not how Wikipedia is supposed to work, I hope. That doesn't sound like the spirit that Wikipedia tries to portray at all. It sounds like the exact opposite.

On your "consensus" argument: since when is a 7-6 vote a consensus? That's a nearly even split. Please.

His "genuine effort to contribute" consisted of proudly ignoring instructions and refusing to read documentation, being mad that his "expert" opinion didn't carry the weight he thought it deserved, and dropping excessively long drive-by rants in various inappropriate locations, including the talk page of an editor whose only offense was volunteering some (sorely needed) advice with a (slightly) wrong link.

Contributions to Wikipedia aren't reserved for people already involved, but following prominently posted instructions and reading some documentation are requirements, for good reason. This is not the story of a mature and reasonable person whose hard work was unfairly dismissed by the secret Wikipedia cabal. This is the story of a temper tantrum thrown by a self-proclaimed "expert" when his ego was damaged.