Of course.
Because "marriage equality," as you euphemistically label it, strikes at a basic tenet of LDS doctrine. Churches are obligated to speak out on moral issues (though I don't know about sects). The Catholic Church, for example, hasn't been shy about its opposition to abortion.
It is possible that you do not know what "euphemistically" means, if you can use it this way.
I use the term marriage "equality" to mean just that--the strictures against civil marriage should be narrowly crafted to prevent specific problems. Citizens, of their majority, able to consent, should be free to marry. If your sect chooses to forbid its members certain kinds of marriage rights, so mote it be...but to presume that a "basic tenet" of the "rules" your sect invented to regulate the behaviour of its members should be applicable to society at large is to admit that your goal is theocracy. You may follow your rules--but you do err when you pretend what others "ought".
While the Church is opposed to same-sex marriage, it obviously has no enforcement power. Moreover, a majority of Americans now favor gay marriage. So why are you so exercised about the issue? Just looking for something to pick at?
I am sorry for you that you are unaware of the money and time your sect spent working to defeat a California proposition. I'm not opposed to mormons working to support, or defeat, laws as individuals. When the sect, as a sect, spends sectarian funds for political activism, it ought to voluntarily surrender its tax-free status.
Once again--despite Janadele's tendency toward sensationalism, no one is considering forcing individuals into same-sex marriages--only allowing couples to marry if they choose, without regard to the ire, distaste, disgust, and abhorrence of those not involved in the union. If I legally marry a person of my own gender--how does that affect you, or your sect?
Some on this forum assume that the LDS Church, all by itself, defeated the CA gay marriage initiative. Please note that other organizations actively opposed that initiative.
Why was your sect, as an organization, addressing a civil law, not affecting its members, at all?
You have still not answered my question about why your sect feels free to attempt to control the behaviour of non-members with the rules invented for members. It' almost as if you are avoiding the question...