Well AI's exist, but not only that, an article from 2015 proves that an AI was able to pass the "self awareness" test for the first time (Source), they are evolving and they are doing it fast, It could be that in the next 10 years we see the 1st AI's working in some government services and doing jobs considered highly deadly by humans. The only thing that every AI should have is the Three Rules of Robotics:

• A robot may not injure a human being or, through inaction, allow a human being to come to harm.
• A robot must obey the orders given it by human beings except where such orders would conflict with the First Law.
• A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.

These are known as Asimov's Laws, an author about science fiction. If say every an AI would have these three laws, they would serve humanity for good and couldn't be able to do us harm, but if your interested in this topic a great movie to watch is "I Robot"(2004), In the movie an AI decides to save a Police officer instead of a young girl in a car accident, there by making the wrong decision putting a great police officer's life as more valuable as that of a young girl because the officer had higher chances of survival.... But the movie also "discusses" other things as well, definitively a must watch movie if your into this. Your post is great , discussing a very interesting topic, a topic that is our near future.