Posting a private letter to the Internet runs against my ethics. I feel when I flag things I should explain. So, here it is. The letter is person to person. It was meant for you Mr. Strauss and nobody else. Mr. Collins didn't make a press release. If anyone feels this is perfectly ethical, I would love to hear why.
Interesting point and I generally agree that it can be unethitcal, though I think there is gray area and you can't say its definitively unethical in all cases (time passed, and content of the letter matter). This is a letter from 20 years ago and I think with that much time passed and given the nature of the content its not unethical to post.