I hate to say this , but you are right to condemn these 'GROT'S' as you call them .
When I first arrived in this beautiful continant over 6 years ago from NZ the first thing I noticed was the amount of rubbish just tossed on the ground by what I was amaized to see ,, seemingly average people , families ( mum's and dad's setting a bad example to their kids ) etc. out on a weekend just tossing their rubbish on the ground 10 metres from a bin
and driving away ,,, all the time ( more often than I had ever seen ) ,,,yes , I know it happens in NZ but I think Aussies need some kind of wake up call on this , heavy penalties? like Singapore ?
My rant , and you are right to complain , I salute your efforts in walking 4km to pick up these lazy so and so's rubbish , good luck .
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Brian.