I recently had the doubtfull experience of encountering an atheist forum the "thinking atheist" that states in the rules that ad hominem attacks and foul language is allowed.
1. Such a forum is inacessible to the mentally handicaped as they can not stand such attacks.
2. A meaningfull discussion about physics as I wanted was impossible.
So how can a forum can come up with such harmfull rules that insult common sense?
In my experience this has more to do with the American idea of "free speech" (that´s totally different from the one we have in Germany - generally speaking) than with anything else. I have been on American music and politics forums that were pretty much ruleless and unmoderated.
I think it is because they want to be "anti-church".
When it´s about motives of others, I´d recommend you to ask them rather than making guesses (particularly when the guesses you make are unfavourable and/or confirm your prejudices).
It is true that the church had a restrictive way of what can be discussed and it as well has a long hold problem with swearing. If you want to be the exact opposite of that than the forum make sense.
There are a lot of possible other reasons for allowing for free expression and choice of words that make at least as much or even more sense. This one, however, seems to be the most convenient one for you.
However some of the rules of the church are extremely reasonable even if you dislike the christian religion itself.
Well, when they are reasonable, they probably will show up in other world views as well.
I think (?) it was Voltaire who in the french revolution stated that the quick dismantling of the church would result in mayham.
I suspect he was right (just like abolishing free gun ownership in America would probably result in a lot of violence, while other countries have been and are prospering without it quite fine). So I think Voltaire made a point about
too sudden and radical changes (which would be a pretty irrelevant point in the question at hand).
If atheism is about beeing "anti-church"
Well, it isn´t. It´s about not holding a belief in Gods.
You are confusing yourself when you make wild guesses about others´ intentions and motives, and then point out that motive and actions aren´t reconcilable. The more self-suggesting conclusion would be: You have guessed wrongly.
than why not be against the command not to murder?
Because there are plenty of non-religious reasons to be against murder, and because not believing in a God doesn´t mean you are in principal opposition to each and everything that may be said in church.
You better not sell people who disagree with you short that way, or you will end up confused.