Why is it that when we preach tolerance we judge and vilify those who don't practice it? Do...?

I am perfectly ready and willing to tolerate anyone who doesn’t try to force-feed me (or anyone else, for that matter) their beliefs. I don’t run around trying to convert anyone to ANYTHING I do—unless they ask. I don’t go, say, preaching the joys of bicycling over the joys of jogging. But there are lots of folks out there whose advocacy of their beliefs is so strong that they feel compelled to insist everyone do as they do. When that starts, my tolerance ends. When they work to legislate their beliefs, they become dangerous. SO disapprove of gay marraige, for example, as much as you wish. But when two people, whether you agree with the relationship or not, are living as a married couple, wish to commit to each other, and ume the rights and responsibilities of marraige to each other? Why shouldn't they be allowed to marry? I've been hearing reports on NPR over the last 5 months or so about the "Loving" marraige and the ociated court case. This was a civil rights era court case--literally, the last name of the couple was "Loving." They were an interracial couple, married, and moved to a state that still had laws on the books against marraige for interracial couples. The court case went all the way to the supreme court, and it overturned those laws. I see this as parallel to the issue of same- marraige today.