On this occasion I think I have to agree with you. Although the probability of it ever happening (being removed from a rubbish bin/bag, and then being used in a way that did harm) is probably 'vanishingly small', the consequences if it ever did happen could be tragic, so the few seconds it takes to render a plug unusable (or, at the least, remove the fuse) is arguably justifiable.In the time it took you to type that **** a couple of redundant plugs could have been rendered safe
This is not (like metal baths etc.) a matter of different views about the relative probabilities of opposing risks, since there is no real downside (other than the risk of hitting your finger with a hammer or suchlike!) of making a discarded plug safe.
Kind Regards, John