questions about nfqnl_test.c

I just have two quick questions.

Towards the bottom of nfqnl_test.c there is the following:

#ifdef INSANE
/* normally, applications SHOULD NOT issue this command, since
* it detaches other programs/sockets from AF_INET, too ! */
printf("unbinding from AF_INET\n");
nfq_unbind_pf(h, AF_INET);
#endif

Why? If this should not be 'normally' done, then why is it in here?

Second, what does INSANE mean? I've never seen this before.

Michael.