I don't think MN does have double standards, it is very rare that any threads are pulled and this is a good thing, otherwise the boards become a reflection of 'their' opinion.
Racist/gay/sexist threads/posts do get left - the OP's/posters get put straight by the (other) 'posters' and it moves on.
As I said earlier, it's like when you buy an orange car, on driving to the dealership there aren't any orange cars on the road, as soon as you leave the lot there are loads!! Are there any more? No, you just see more because you now associate with it.
Do you want a site that is heavily moderated? I don't. If you do, you would have to take the good with the bad and without wanting to start another arguement, there are already boards like that out there - have a peek on NMs for example.