Nobody but nobody no matter what should raise their hand/fist to an elderly person !! Never mind what the elderly man was doing. It rather sounds as though you too are an advocate for bashing the elderly ??
Now, you see, in 'my' world -different, it appears, from your own?- we are constantly reminded that bad behaviour is bad behaviour whether one is 8 or 80, ie neither is acceptable. Translated, surely it has to mean that whatever is deemed the appropriate way of dealing with one, must also be the appropriate way of dealing with the other? Ergo, whilst, on occasions, fractious/screaming children DO wind me up, there's usually a reason for it which can't be expressed any other way, whereas adults have other means of venting their feelings. It wasn't necessary for PE? -despite his anger- to thump Nevill, who, incidentally wasn't "an elderly man", any more than it was necessary for Jeremy -despite his apparent frustrations/feelings of entrapment?- to slaughter his entire family. But such is the way of the world, eh?