We don't close comments because some comments are good. But some are boring, particularly the generic ones and the indignant ones. To make HN discussions better we need to make them less boring, i.e. less predictable.
Nobody figures generic things out. They're too generic for that. The true things you can say are trivial and the non-trivial things are untrue.
The grander and more general a topic, the fewer interesting things there are to say about it—especially in internet threads. Those few things get said over and over, making the threads predictable and boring. The solution is to avoid such tangents. To avoid a black hole, don't go near it.
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