No they do not, genetics teaches us it is very hard to spread a new gene. In fact, it is because of the difficulty in spreading new genes that Gould broke from the Darwinians and started punk-eek and why Kirmura broke from them also and developed the theory of genetic drift.
Here you give a very good example of the scientific method as applied to the theory of evolution at work. Individual scientists may not agree with the accepted methods of the theory, and when given scientific reasons for doing so are not derided or laughed at, but their ideas are accepted by many as possibilities.
Notice that none of these scientists are rejecting evolution theory, just arguing about its mechanisms. Science at work, it's lovely, as opposed to "The Bible says so, end of discussion."