No, Bill, I absolutely do not fail to see that this is true for some people, and I have never once in this conversation denigrated monogamous relationships or the people that choose to be in them. I am constantly thrilled for my friends and family who are in happy relationships of any type, and I have awesome role models in both traditional and non-traditional relationships.Perhaps you're failing to see how a one-to-one love can be so strong that there's no room for anyone else?
There is a possibility for virtually anything to happen in my lifespan; and my relationship choices leave me open to those possibilities.
But I do not see a likely scenario where I would want to heavily restrict the freedoms of someone I love, unless they are doing something that harms themselves or others. One thing that I don't think you understand (that's not a knock on you -- if you've never been in the situation, I don't think you _can_ understand it), is: it is amazing to see someone that you love be loved and supported by someone else, too. Knowing that someone you care deeply about has other people willing to do anything for them? Awesome.
(And let's not forget that every monogamous relationship can "remove people" from it, too -- it's called breaking up. The vast majority of relationships, monogamous or not, end in that way -- not in "happily ever after.")