Actually I would argue they already have tried your method. People have been more politely asking for something to be done about these cores for a fairly long time, and yet they seem to have been ignored for the most part. So it makes sense that this would be the next step, people tend to get annoyed and a lot louder when they feel like they have generally been ignored.
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True, people may have done so. It's not hard however to take a breath and think before you write something. I hardly doubt these same individuals would do the same thing at their place of work or school and expect positive results. It's okay to be frustrated. We don't need to read a raging lunatics dissertation as to why they hate XYZ today. It makes for a more pleasurable read and even better discussion. It's ideal yet not unrealistic.
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But the thing is it does happen in real life, in fact it happens all the time. They are called protests. A group of people coming together to basically yell in one way or another, the same thing as one another. It is the same kind of thing here, by making multiple posts all saying the same thing it forces Bungie to see them, and acknowledge them in one way or another. Which is the same thing a protests tries to do. It is a way of ensuring that you are seen, so the group you are trying to get through to cannot possibly use the excuse of, "we didn't know" or "we were never told this was an issue". This is just an online version of what happens all the time in real life. Let's just hope we never seen an online version of an actual riot.