People's image of HN mods' political bias is entirely predictable from their own ideological affiliation. Strong rightists think we (and HN itself) lean left, strong leftists think we (and HN) lean right. Since the conclusions you all draw are so contradictory, I don't think these charges have much informational value—at least not about us. There's clearly a cognitive bias at work here.
If you don't believe me, here are some quite typical posts that run the contrary direction to yours:
https://news.ycombinator.com/item?id=16019694
https://news.ycombinator.com/item?id=15307091
https://news.ycombinator.com/item?id=15034119
https://news.ycombinator.com/item?id=14529468
These people are having the same reaction as you are, they just start from the opposite end of the football field.
That doesn't mean we're magic centrists in a centrist fairyland. It means the situation is affected by other factors, some of which aren't obvious. If you want to look at this objectively you have to work to suspend your own political feelings, which is not easy to do and not something many people want to.