Leading according to whom? Well, you have a choice to make, I guess. Either the majority are lying, including their leading activists, when they say they're not trying to "destroy marriage", or the minority is lying. Ockham's razor does the rest.
Masha Gessen, is a journalist, author, and activist and has written extensively on LGBT rights and help founded the Pink Triangle Campaign. Gessen has been a prolific contributor to such publications as The New York Times, THe Washington Post, the Los Angeles Times, The new Republic, New Statesman. Granta, Slate, Vanity Fair, and U.S News & World Report. She has also appeared in the Australian comedy Mad as Hell.
Masha Gessen said that the push for gay marriage has less to do with the right for gays to marry and that instead its about
diminishing and eventually destroying the institution of marriage and redefining the traditional family. She said at a LGBT convention, that
"it's a no brainer, we should not have the right to marry and that equally it's a no brainer that the institution of marriage should not exist". If you listen to that You Tube video below you'll hear that
the LGBT audience shout and applause in approval for this comment, so we see it's not some minority view as you're hoping for.
Masha Gessen's comments confirm the point made by Julia Gillard that the activists pushing same sex marriage are the same people who have always claimed (like Masha Gessen) that
they do not believe in marriage, claiming that it is patriarchal and old fashioned.
You seem to want to put your trust in the lies (as LGBT activist Masha Gessen calls it) of those who do not believe in the institution of marriage.
Be so good as to give me a summation in your own words.
You didn't actually answer my question, by the way. So again, "what are you actually, specifically worried is going to happen?" In real world, concrete terms?
It seems that you are so determined to believe the lies of LGBT same sex marriage activists that no matter what I show you, you will not accept any facts that challenge your beliefs.
Anyway, their goal is to so diminish the definition of marriage, such that it will eventually include polyamory too, that the institution of marriage will become so meaningless that it will eventually be discarded. And this is their aim. They have even claimed they believe children should have many parents instead of the current biological mum and dad who are married.
These goals are consistent with the goals Communists had stated decades ago. In 1958 a book by an ex FBI agent Cleon Skousen, who had been researching the Communist movement, listed the goals that the Communists clearly stated at their meetings. Below is a link to a 1 minute You Tube video that even you will have the time for. It lists some of the goals that the Communists having been working towards for the past 50 years or so.
Goals such as:
Discredit the family as an institution. Encourage promiscuity and easy divorce.
Present homo-sexuality, degeneracy, and promiscuity as "Normal, Natural, Healthy".
Many of their goals have been achieved or are close to being attained. Even Yuri Bezmenov, a former member of the Communist KGB before his defection several decades ago, said that the Communists he was working with were surprised how fast their goals of subverting western society were being achieved.