You watched a biased documentary designed to make you believe he was innocent. This is what you came out from it with.. staggering.

I also see a really weird trend on reddit when people discuss this case that Steven must be guilty because he killed a cat as a teenager?

I haven't seen this. I have seen people reference the preponderance of evidence that indicates Steven Avery is guilty. I have also seen conspiracy theorists get out of control on Reddit, the Steven Avery case being a great example.

I'm glad we can agree that someone is not guilty based on things like their personality, and what matters is whether or not they actually did the crime.

Again, genuinely amazed that you came out with the perspective you did. Not every filmmaker is genuine, think about the content you're consuming. Think critically.