In light of recent events, I intended to write a simple letter of complaint to StackExchange. The obvious thing to do would be to write an opening with the fact such as

> It came to my knowledge that a long-standing member and moderator of the Writing.SE community, among others, has been dismissed in circumstances that are short of the adverb "summarily". 

I wanted such opening to be strong and to resonate with reader. I find that it contains far too many words, and thus not quite reaching the point. 

In general, I find that opening with a fact is not quite as strong as opening with an emotional argument. For instance:

> Never I would have believed to consider StackExchange but the mask before the monstrous face of intolerance.

The latter may resonate deeper with the reader, but it does not hold its ground in an argument. Moreover, my entire letter may be dismissed as a rant for the simple lack of facts.

How to construct a resonating opening line in a letter when stating a fact? What is the structure and language of a strong opening line that cannot be easily dismissed?