Of course it is a deeper problem! But that design will probably prevent at least one opportunistic stabbing over its time, so it helps in a small way
Ever heard of sliced throat? No, this won't help at all, wishful thinking is very deceiving. Who wants to stab, will get a thing to do it. This is just stupid marketing.
Oh yeah. The good old argument "if it would save a singles life" (whatever cost for taxpayers) Interestingly enough it is used only to enforce regulations and limit freedoms.