However, Assange has always displayed a great respect for human life, and so, this doesn't sound like him at all.

I can't find any clip of this, nor anyone discussing this, and have never heard of it before your claim. Care to bring receipts?

Edit: Looking more into it, I found the source - people said that Declan Walsh said that he heard Assange say this at a dinner party. You really ought to be a little more discriminating when using a single quote to try and completely dismiss someone.