If you have questions like this, you should be sending them to hn@ycombinator.com so we can actually see and answer them, not posting metathreads about it. (This is in the site guidelines: https://news.ycombinator.com/newsguidelines.html.) The only reason I found out about this thread is that a different user did email us.
It's all too easy to look at a limited set of datapoints and misinterpret what you're seeing. For example, some spam rings post legitimate (or legitimate-looking) submissions in order to cover for their spam. If you see a submission like that being auto-killed, you might well think "how can the moderators possibly be so heavy-handed" when in fact we're working hard to prevent spammers from taking over the site.
It's a constant struggle, like a cat-and-mouse game crossed with an arms race, and it's impossible to get the anti-abuse code perfect, so there will always be false positives. When you see those, you can help by vouching for them and/or by letting us know about them at hn@ycombinator.com so we can fix it. Many users do those things every day.