It's a two-sided issue: those who are discussing spoilers need use their brains and tag thread titles and comments appropriately as spoilers much like Magnum Opus did just now, and those who don't want to see spoilers need to understand that the game is two weeks away and spoilers are just going to happen so they need to use their brains too and either be very picky about what threads they open or just go dark since the risk is increasing.
Edit: for example, in the thread about discussing trophies where you thought the op was talking about physical trophies is just...freaking silly. I'm almost positive you know that a trophy would mean an achievement... although, the op didn't even try to use prudence and lacked the respect or consideration to give a warning.