Well, I'm not above a good piffle or too, and my wife says I'm never grouchy, because I was born naturally ill-tempered, so you're probably at least partly right. However, you are wrong about Ayn Rand's intent in the quoted passage. She was not answering a Bible passage, but the words of characters in her story. If you want to make the case the those characters were quoting the Bible, you know more about what fictional characters think than I do.
Ayn Rand rejected the Bible and Christianity because she suppose that those who call themselves Christians and claim to beleive the Bible would know what it teaches. In this she was very wrong, and rejected Christianity on the basis of what Christians teach, not what the Bible teaches. If I thought the Bible taught what most Christians falsley believe, I would reject the Bible too.
Hank