In answer to your question in the title the answer is, we have the same set of rules as you and we try to adhere to them.
why do mods, only moderate certain topics.
We moderate all threads in the public forums.
The amount of anti Jewish propaganda threads, that seem to pop up on PF is somewhat worrying, why is there NOT a anti racist policy on PF?
The threads in the main forums are/ should be Polish related, If they're not they go to off topic or the bin. Everyone is entitled to free speech as long as it's civil,and everyone is entitled to reply; as long as it is also civil. Blatant racial abuse will not be tolerated.
I would suggest you have a look through the random chat thread, to see that many blatant racist comments and racist threads have been moved there. If you come across any on the main forums you should report them through the correct channel.