If it's really ridiculous, PM the mods your opinion. And say it in this thread of course. I wouldn't disagree with you either, as I said I recognize the restrictiveness of it as well. I would still agree on the removal, but warnings and punishments will be way overboard (though you said "demands" for punishment so I assume it's not the initiative of the mod?).
But depending on context "Person A will be important" can be spoilerish. Standalone, that's overkill. But conversations don't exist in a vacuum. A hypothetical example would be something like:
Poster X: Whoa, big cliffhanger! Looks like we have a turncoat in the gang.
Poster Y: I'm guessing it's Person B, C, or D.
Poster Z: Person A will be important.
Bang, spoiler. Sure, Person A might not *be* the turncoat, but the one who will out the turncoat, save the gang, whatever. But it's information that an audience of the show would not have otherwise known without this pre-exposure.
Did you not read the explanations earlier? There are degrees of severity, and spoiler tags *are abused*. Some idiots don't label big spoilers properly, while some people err on the caution and hide not-too-spoilerish information in their spoiler tags (I do it too for manga threads on newly scanned chapters that just got released, with the format "Ch XX, just in case"). This can create a problem of the spoiler tag inflation, which means I might be contributing to the problem here, but I'd rather be overly nice than be a bitch and ruin someone else's enjoyment of a show.
I don't blame the victim. Sure, it could be a "compulsion" to click a button you "shouldn't click," but I'd argue just the same it's also a compulsion to tell people what you shouldn't tell. No thank you I don't need to know Character ABC died in Episode 23 because you [not you, SeedFreedom; general you] would like to feel l33t and superior for downloading and watching the raws and wasting your time getting obscure spoilers from Japanese magazines.
The mods wouldn't need to be this highly restrictive if people are clear about what's in their spoiler tag (e.g. "Big spoiler from episode 23"); they're not. Separate spoiler threads would still be useful of course, but leeway could have been given much more if people recognize that simple courtesy.
Depending on the location, it can be a spoiler.
Sure, the thread on the last episode of Code Geass will have big discussions on the big things that happen in the last episode of Code Geass, and we don't need spoilers there -- as is already the case -- but it *is* a spoiler, and I *am* going to report it and bitch about it, if this information is in the thread of the first episode of Code Geass, or some other unrelated thread completely. By the way this really big event happened to one of the main characters of Code Geass in the final episode, didn't you hear?
There's also a delay time between release and download and watching that will have to be taken into account. Nobody catches up right at the moment the fansub's finished and released.