But they don't bomb or vandalize the clinics that engage in fertility treatments, so they don't get reported. They're also not just real common in major media centers.
Some aren't against the production of fertilized eggs, but are adamant in their opposition to disposing of them.
Others think destroying them is wrong, but that wrong is outweighed by the greater good that could come from the research. Others have at best only a small problem with destroying the embryos, but believe that benefiting from their destruction is equivalent to profiting from the results of Nazi experimentation on concentration camp inmates, with all the ambiguity that belief holds.
Remember, the inmates were going to die anyway, but there was nonetheless international revulsion at the idea of using the resulting data, which sometimes couldn't be obtained any other way.... See
http://www.bmj.com/cgi/content/full/313/7070/1422 for discussion of possible Nazi drawings used in an anatomy textbook, a debate that included calls for avoiding the textbook, a very few others for completely ignoring the origins of the drawings, with the intermediate position holding that "to the extent they're useful for saving lives, we're stuck with it ... for now." This trichotomy mirrors the embryonic stem-cell debate, for about the same kinds of reasons.