Mainly because the hierarchy of the LDS Church has been actively working against marriage equality for 11 years, exposes the Bay Area Reporter:
The March 4, 1997 memo from Loren C. Dunn to church Elder M. Russell Ballard, describes an insidious “go ahead” HLM (homosexual legalized marriage) strategy of the late Mormon Church president, Gordon B. Hinckley. The memo appears to be tangible proof that Mormon leaders had been working to prevent marriage equality in California and Hawaii at least for the last 11 years while actively working to recruit the support of local California Catholic bishops…
Posted by Michael 