Purpose of a Black Hole in an Organized Universe

On Wed, 3 Mar 2004 wrote:

The Universe has had billions of years to organize itself and it is
not just random kaos any more. Our solar system and billions of others
seem to be fairly well organized or there would be constant kaos.
Black holes have organized themselves at the center of galaxies where
there are greater gravitational forces and that organization implies
to me that there is some kind of purpose for it. But what might that
purpose be?

Would anyone care to venture a theory as to the purpose of a black
whole.

To keep a galaxy together.