So far every example you have come up with has just shown that you have no knowledge of the subject.
Guess you never read the ENTIRE article. as usual.
Abstract A model is developed for alternate fixations of mildly deleterious and wild-type alleles arising by forward and reverse mutation in a finite population. For almost all parameter values, this gives an equilibrium load that agrees closely with the general expression derived from diffusion theory. Nearly neutral mutations with selection coefficient a few times larger than 1/(2Ne) do the most damage by increasing the equilibrium load. The model of alternate fixations facilitates dynamical analysis of the expected load and the mean time to extinction in a population that has been suddenly reduced from a very large size to a small size. Reverse mutation can substantially improve population viability, increasing the mean time to extinction by an order of magnitude or more, but because many mutations are irreversible the effects may not be large. Populations with initially high mean fitness and small effective size, Ne below a few hundred individuals, may be at serious risk of extinction from fixation of deleterious mutations within 103 to 104 generations.
You might find this informative as well.
You might find this informative as well.
http://www.biomedcentral.com/1471-2148/8/88>
In fact there are too many to list, so you better rethink your assertion that "mutation doesn't cause extinction".
There is more than ample proof to the contrary.