It's a culture thing, and mob mentality. A few leaders set the tone and then everyone runs with it, eager to make their mark. Every major event, especially those with strong emotional content, starts with a trigger post, followed by a deluge of "my take on X" posts, complete with 600+ thread comments, after which it slowly fades away, with only a few hardcore people shouting "why doesn't anyone care about X anymore!?"

That's human. That's culture. The negativity will eventually fade once the general startup mood improves from massive infusions of cheap money again, at which point the same fad cycle will continue to occur, but with a much rosier tint.