Judas did show regret at least. Monsters such as Mao, Stalin, and Hitler did not. And BTW, neither does 0bama.
Before the fact, Jesus said it would be better had that man never been born which wasn't said about anyone else; however, those who said he was casting out demons by the power of Satan, Jesus said that they had committed the unpardonable sin against the Holy Spirit, the only one that could never be forgiven. That's all I can think of Jesus said applying to people of his time; the rest was usually in parables..
So whether the pope said what they say he said, that is what scripture says Jesus said.
There is lots more about sin spoken by the Apostles and also I think Jesus in John's vision in Revelation.