The probability of anything being said in a given thread tends to one as the thread increases in length. But the probability of someone referring to a similar principle for a given subset of things to say like you just did tends to one faster.
There's been plenty of threads that has devolved into political, religious or otherwise controversial discussions in threads where they didn't belong. I have yet to see anyone state Godwin's Law in those threads.
Also FYI, the parameters for Godwin's Law has already been met previously in this thread.
Most recent example, excluding this one, is Panos' thread in us gentlemen's board, which turned into a rude exchange about nationalism and xenophobia.