It is rather typical for children to wear clothing which is considered fashionable by their peers.
But am I to understand you equate the wearing of a trashy Tshirt with a cold blooded crime as far as wrong actions go?
Depends on where they wear it and their parents (especially such high profile parents) really are in control of what they wear
Not hardly, just an exaggerated example, per your own example, to show that age and action can and should be considered on their own merits.