Actually, you could, just by ignoring the things you don't see evidence of and focusing on the points that do, and assessing them based on merit.
No, you really can't. Just by including the other points in the discussion, but being unwilling to extrapolate on them, shows bad faith (perhaps unintentionally) on the part of Steve and compromises the entire discussion. The only reason you include some vague "Amazon did shady shit" in a tweet is to elicit an emotional response on the part of the reader and immediately biases the argument against Amazon. The argument is not based on merit; it never can be now, because it's been tainted. This is known as "poisoning the well" [0].
Even in this thread, commenters are saying how they implicitly trust Steve not because of the merits of his argument, but because of his personal brand. He's (again, perhaps unintentionally) taking advantage of that fact by mud-slinging at Amazon, priming readers to already be biased against Amazon, and then once called out on it the response is "oh just ignore the fact that I did that and look at this other argument which I promise is more substantive". That's not arguing in good faith.
I see all that Steve has done for Rust and I see him post here (and on reddit) a lot, so I have respect for him. But this "discussion" was brought up completely the wrong way by him, and any outcome is going to be tainted. It'd be best to just let this current discussion die, and bring it up again in the future in a more appropriate manner.