Some arguments against disclosing the IP address include:

1- Privacy is important. Not all posters want to show in what city and country they are located, for whatever reason.

2- Some teachers face serious threats when they choose to post against a school: Threat a) to be fired, b) to be immediately thrown out of their apartment without any pay/reimbursement of expenses, c) to lose their possessions left in the apartment d) to be placed on a blacklist and denied the necessary documentation, e) to be deported and barred from the country for ever, f) to be sued (in Korea, I am being told repeatedly, it is illegal to post against a school even if the alleged facts are true), g) PHYSICAL threats to themselves and their families including threat to be arrested (like when a school has a friendly cop in their network) and even death threats. Some schools even have possession of the teacher's passport. The IP address could/would show that the teacher is using the computer network of the school, or is still in the same city, and could be used in court (Korea) to show the identity of the poster. Moderators who receive distressed emails from teachers who are afraid for their life and beg - beg - to have their post removed, know this situation all too well.

If you post a Thai recipe, it's ok to show your IP address. If you expose a school regarding topics that include child molesters, identity theft, rape, embezzlement, other serious illegal activities, even lesser ones like the DOS having a fake diploma, it's not ok to show your IP address.

The price to pay is to have the occasional woodpecker troll also post as a maria. It's a small price.

"Choose whatever you want, said God. And pay the price." (old proverb)