I fully agree that the the letter is inappropriate and cruel.
As a sec-gen of an opposition party, he should have separated what he wanted to said into 2 letters. 1 purely a letter of condolence and the other, how people were detained for years by LKY.
But like what I said earlier he is a great opportunist. The purpose of the letter is not to console (definitely not), but taking the opportunity. While LKY and his family are grieving, he wants to hurt them when they are saddest by bringing out all the "crimes" which LKY has done over numerous people over the years and illlustrate that while he has lost his loved one, many others because of him has lost their loved ones as well. And the most hypocritical part is "I mean no ill will".
It's like stabbing someone and then said, I don't mean it you know.
Of course, by separating what he wanted to said into 2 letters would not have this effect without hurting people at their saddest. CSJ achieved his revenge, not to bring out all these points, but for instant gratification. I pity those he brought into the contents of this very "condolence letter". They are the most innocent.