Did you notice, at Wiki: http://www.wikipediaondvd.com/nav/art/w/3.html , all the "pictures" but one are "artist conceptions?"

The one actual photo of the cosmos is captioned, as it must, with "The jet emitted by the galaxy M87 in this image is thought to be caused by a supermassive black hole at the galaxy's centre."

There are several more plausible explanations. Do a little research!

Black hole are "predicted by "general relativity." Since the general theory of relativity has been "proven" (What specifically is the proof?) Therefore, Black holes exist?

People see creatures and all sorts scenes in the clouds. Does this prove anything other that the imagination is truly remarkable?

Sure, artist conceptions are just as good as pictures from telescopes. Its an Alice in Wonderland world. Why not just "photoshop" the telescope pictures?

Thus, Black Holes exist in the minds of those whose belief is that gravity rules the universe. Never mind that there are simpler explanations.