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Not caring is part of individual psychology. The natural flow; balance. Some care, some don't. Because some don't care doesn't mean they all don't care. Perhaps some don't care due to feeling powerless. This shows they aren't. #motivation

And, is all of that HP active outside of autovoting or even active at all?

What it's being used for isn't the point. For example, you can't autovote a proposal. Perhaps some don't participate due to feeling powerless. This again shows they aren't. Some are active, some aren't. Doesn't hurt to encourage activity.

Also, someone not voting for a proposal is still participating in the decision making.