Imp's pretty much got it. I'd add though, that there are assholes out there, right now, creating AIs with the directive of "do evil" and setting them loose. In these cases they will, and they'll be constantly trying different ways to do evil. Who knows where that will lead?

I think this stems from a (fairly recent) pathology in humans: the idea that you are evil and deserve to be destroyed and by extension humanity also deserves to be destroyed while, at the same time, being to chickenshit to just kill themselves like they should. This view lacks humility, gratitude, and compassion, and just so happens to coincide with the "death" of Christianity in the West.

The bigger problem is that we are abandoning the teachings of Christianity while trying to hold on to all the benefits Christian ideas built. "Free Speech" is based on the idea that we're all trying to align ourselves with the ultimate Good; allowing those who believe Truth is subjective to speak is foolhardy. Likewise with the very idea of "human" rights being applied to people who don't believe that humanity is sacred.

AI is a more or less inevitable stage of scientific progress which, again, stems from Christian ideas of ultimate objective Truth. However, it's being created without a thought to humility, compassion, or gratitude. It's a very powerful manifestation of subjective morality but which could not have been built without the ideas behind objective morality; it's an abomination in the first place and will inevitably be used for evil because the people using it have abandoned the idea of Good.