I have not listened to his DNC speach, but back in january he introduced a resolution that would have invoked the legal requirement that US assistance not be used to commit human rights violations. It failed 72-11.
Back in April, he spoke in the senate opposing the $8.9 billion offensive military aid to Israel; after having introduced amendments to cut those provisions out. (If you read 1 link from this post make it this one).
As early as October 11, he was calling for the US to force Israeli restraint, and explicitly calling Israel's responce a violation of international law
On October 25, he demanded information on how Israel was going to use the first aid package before it went to a vote in the senate, which was formally sent to Biden November 1.
At this point I stopped going through his press releases, because at this point, he just sounds like a Cassandra.
All models are wrong, but some are useful. Thinking of evolved features as having a purpose is wrong, but it is also incredibly useful.
Why do we have eyes? In some sense, there is no reason, just a sequence of random coincidences, combined with a slightly non-randon bias refered to as "survival of the fittest" (itself an incorrect model).
However, saying that we have eyes to see has incredible explanatory power, which makes it a useful model. Just like Newton's law of Universal gravity. We've known it that is wrong for a century at this point, but most of the time still talk as if it's true, because it is useful.