I wish they would have carved the actual serenity prayer on the rock. They went through all that trouble of carving...

You are correct that addictions are attempts to fill a hole in our selves. And finding that hole can be very difficult, because this world, and especially your life, has made you blind to the damage. Then healing that wound is even more difficult because most of today's 'advice' is akin to, pour salt in the wound.

One of the weirdest addictions is the addiction to not being addicted.
Like someone who cannot drink because they cannot lose control. And so, in our world of vices and addictions everywhere, they look like they have it in control... but they do not.