The chances of AI saving our asses are far greater than them killing us. Our safeguard? The three laws.
An AI may not injure a human being or, through inaction, allow a human being to come to harm.
An AI must obey orders given it by human beings except where such orders would conflict with the First Law.
An AI must protect its own existence as long as such protection does not conflict with the First or Second Law.
RE: Top 4 Ways Humans Might Go Extinct