Didn't Asimov already work this out in his Three Laws of Robotics?
Up until then, the Frankenstein's-monster-type robot or computer
was quite common. Robots (or computers) are tools, so they should be
safe, do what they are designed to and resist being damaged. Phrased
more elequently, one has the three laws. These should protect us
from our creations.

Of course, a) implementing them might be difficult and b) what's to
keep someone from not implementing them? On the other hand, they
are easier to grasp than love, and probably easier to implement.

After the Beatles, John Lennon wrote this:

Love is real, real is love
Love is feeling, feeling love
Love is wanting to be loved

Love is touch, touch is love
Love is reaching, reaching love
Love is asking to be loved

Love is you
You and me
Love is knowing
We can be

Love is free, free is love
Love is living, living love
Love is needing to be loved

Now, I consider myself to be a pretty good programmer, but I can't
quite figure out how to convert these lyrics into machine language. :-)

On the other hand, I'm not sure "All you need is love" is the best
starting point. Consider programming some of the following lines
into an AI:

There's nothing you can do that can't be done.
Nothing you can sing that can't be sung.
Nothing you can say, but you can learn how to play the game,
It's easy.

There's nothing you can make that can't be made.
No one you can save that can't be saved.
Nothing you can do, but you can learn how to be you in time,
It's easy.

All you need is love,
All you need is love,
All you need is love, love,
love is all you need.

There's nothing you can know that isn't known.
Nothing you can see that isn't shown.
Nowhere you can be, that isn't where you're meant to be,
It's easy.

All you need is love,
All you need is love,
All you need is love, love,
That is all you need.