Let’s get a grip, shall we?
Even assuming that it was “an attack”, it hardly qualifies as the crime of the century. I doubt if in NYC it was even “the crime of the minute”. A hole the size of a quarter on the arm of a dress? I’ve been injured worse on a vacation trip to the beach with friends – and we’re all still friends.
Let’s assume for the moment that it was deliberate, that it was unprovoked and that it was done with an intent to create great bodily harm or even death. In other words, assume the worst about the attacker. In execution, it’s still essentially nothing, even if it has damaged the peace of mind of an undeserving victim. In that case I agree that it is beyond the pale and worthy of condemnation, outrage and prosecution, but it’s still much ado about not much.
All of the things that I stipulated to in the last paragraph would still have to be proven in court to be accepted as true, however. I doubt whether that can be done even if the man can be tracked down and arrested.