Why do people do it....seriously

I just spent a fair amount of time measuring out a response to a lady who posted in CC completely mortified that her son had been assumed to be autistic...

I typed out a response, well thought out, measured, with a balanced view of her post only for the post to be removed.

Really seriously ticked me off. As a mother to an autistic child I really wanted to enlighten her a little, maybe educate her and dampen her ignorance just a little - obviously in a constructive manner...

But instead..all I got was the dreaded black line "failed to post"