We do have members from all walks of life, some find swearing offensive others don't, such is life. We have never yet has a post reported because no one swore in it!
We have many members with young children; many of these little ones like sitting with daddy, browsing through the forum looking at the pictures of cars that are just like daddy's. Again, many of these daddies dislike explaining to the little one some of the more choice words before they have to...
And lastly, we've experimented with the "lets allow mild" stuff, just like they do on the beeb; steadily threads got more and more aggressive language wise as those that didn't watch Top Gear and appreciate being called a dangler was a good thing would strike back with slightly worse, things just kept spiraling.