why french people write in french and all of us write in english? If I write in english is because I want everyone understand what I mean. Therefore we can discuss and get ideas. I´m spanish and write in english, portugueses write in english,.....
And ? What's the point ? French write in French in order to understand better each other. It's the same for the spanishes, portugueses etc.. on their own forums. Then, you and we make a detailed summary of our ideas and we share it so every body can see it. I don't see what's troubling you in this.