OP - don't worry, i think your warning was fine - I did write a massive post yesterday in support of you over the calls for better warnings then I deleted it because I did not want the thread to deteriorate into a bun fight.
I have had the same accusation thrown at me when I have clearly said "warning: very upsetting story about children" or similar,leaving posters to decide whether or not to open a link - and people have complained because they foudn it a bit too upsetting. on the other hand, you give a tiny bit more detail about the story in your title or OP and other folks have a go at you for saying too much so that they could not avoid a topic they would rather not see!
you just can't please everyone, don't feel down about it!