The thing is that Alex as a lay person realises that what he believes or choses not to accept is just a personal view....You on the other hand seem to be saying all cosmology is wrong and you are its saviour...yet you offer nothing as an alternative.
An Electrician is a noble trade my friend as is my trade, but we are not really qualified to question the accepted evidence based models of mainstream unless we have something to replace them.
DM in the beginning was a fudge factor, but in the many tears since it was first proposed, it has gained tremendously and is now accepted. Why? Not just because it is "mainstream idea", but because of observational evidence such as the following........
http://chandra.harvard.edu/press/06_releases/press_082106.html
NASA Finds Direct Proof of Dark Matter
For Release: August 21, 2006
NASA RELEASE 06-297

X-ray/Optical Composite of 1E 0657-56
Press Image and Caption
Dark matter and normal matter have been wrenched apart by the tremendous collision of two large clusters of galaxies. The discovery, using NASA's Chandra X-ray Observatory and other telescopes, gives direct evidence for the existence of dark matter.
"This is the most energetic cosmic event, besides the Big Bang, which we know about," said team member Maxim Markevitch of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass.

Gravitational Lensing Explanation
These observations provide the strongest evidence yet that most of the matter in the universe is dark. Despite considerable evidence for dark matter, some scientists have proposed alternative theories for gravity where it is stronger on intergalactic scales than predicted by Newton and Einstein, removing the need for dark matter. However, such theories cannot explain the observed effects of this collision.
"A universe that's dominated by dark stuff seems preposterous, so we wanted to test whether there were any basic flaws in our thinking," said Doug Clowe of the University of Arizona at Tucson, and leader of the study. "These results are direct proof that dark matter exists."
more.......
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