It is, after all, an exaggerated example, so it should be given a pass, no?
If an eleven year old was to shoot someone in cold blood I would indeed say there was something very wrong with that eleven year old.
And sadly these days it is not too far fetched to believe such a thing could be a possibility.
But I still say that to attack an eleven year old personally because of a clothing choice is wrong. Nothing wrong with criticism or voicing reservations about the choice but to impugn a child over such things is a low blow.
And yes I think her parents were wrong to allow her to wear it. I only saw a glimpse of the photo (I never did see the original post) but I though the shorts were immodest and the shirt itself rather trashy looking.