[Not just destroyers
Astronomers theorize warm gas escaping black holes can encourage life.
Provided by Harvard Smithsonian Center for Astroph]

[April 23, 2007
New research shows that black holes are not the ultimate destroyers that are often portrayed in popular culture. Instead, warm gas escaping from the clutches of enormous black holes could be one source of the chemical elements that make life possible.]

From Astronomy.com: http://www.astronomy.com/asy/default.aspx?c=a&id=5465

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Andromeda Galaxy (M31): http://chandra.as.utexas.edu/~kormendy/m31-bh.html

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Milky Way:

http://www.sciencedaily.com/releases/1998/09/980908074632.htm

It is possible that supermassive black holes reside at the center of every galaxy, whether they be dormant or not.

There may be a correlation there between black holes and supernovae, however. (?!)