I in no way shape or form took the time to read these topics throughly, but either way (whether not this applies or not, like I said I did not read the topic that in depth) people are entitled to their own opinions on topics, whether you think they are wrong, inhuman, or what not. Otherwise we probably wouldn't be allowed to even make topics like this, in fear that "oh his opinion is fucked up blah blah blah *madness insures*"
Whether someone might just be trying to cause a fuss, most of these things aren't worth arguing with people with differing opinions because most of these people (and probably even you yourself with certain things) have something called
belief perseverance which is when one clings to their own initial bias, and refuse to change it for a new one even after their own has been discredited. It's almost a more scientific way of saying "you can't handle being wrong" though sometimes it's not that simple. Sometimes these biases people get come from their cultures and how they were raised, so sitting there saying "wow this person is an asshole, I can't believe they think this way" yeah I mean it's a normal thing to do, but if you take the time to think about the persons background, that might not always be justified. Now I don't think it's right for a person who is fully aware that his extremely differing opinion to come and make a problem of things, probably fully aware of it, however he is free to express his opinion if he so chooses to.
Like I stated above, this might not have that much relevance to what is happening, but I still thinks it's good to keep in mind when trying to argue with someone about what they believe in.