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I agree that you didn't do a lot *directly* or *personally*, but that really dodges your real responsibility. The threat of spoilers does not only come from my choice (in this case, choice NOT) to go look at the material myself. It also comes from other people's desire--oblivious or malicious--to go look and then tell me what happens when I am not prepared and don't expect it. That's why I said you may already have done damage.
The "change the channel" argument works with TV censorship. It really doesn't work in a commons dilemma, which is what we have here. I can make all the spoiler-free choices I want, but I'm at the mercy of those who choose otherwise. Reporting news is different from enabling mischief.