When wise robots arrive, will they be smarter than people who have destroyed each other for Millennia?
Will they force us to live in peace and prosperity?
Will they expunge our stupidity from our minds to achieve their goals?
Will they make us to be like them?
What is scary?
"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 to 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."
The 3 laws only apply to robots who are program with them.
An Artificial intelligence is capable to program itself. While the directives can be implanted on the machine. There is nothing in the 3 rules that will prevent a robot to create another robot without those rules.
There is also the unlimited resource of human stupidity of those who work on weapon manufacturing. Killer robots cannot have those directives. So when the singularity happen, it will have plenty of fire power. Courtesy of our own stupidity.
There is no one more stupid that someone that believes himself wise.