A good walk ruined

My dog Dyson is getting on a bit now, but he does look forward to his morning stroll on Wirral's Moreton common and along the sea wall. We do this through rain and shine, and have battled through some pretty miserable weather over the last few months, so I was really looking forward to the rare treat of striding out in the sunshine in shirtsleeves for a change.
But what confronted us when we got there? A sea wall not just littered, but absolutely strewn, with food cartons, crushed beer cans and bottles, many of them shattered into nasty little green shards.
This walk is a wonderful free resource for everyone, and at weekends like the one we have just enjoyed, the place is bustling with people out to take the air and enjoy the view or some exercise.
It is also a magnet for some spectacular sea birds, and there are often a healthy smattering of bird watchers out among the joggers, cyclists and my fellow dog walkers.
Sadly it appears as though this weekend the warm weather has attracted some people who can't enjoy such a delightful resource without wrecking it for themselves and others.
I would imagine some poor souls from Wirral council's environmental team will have the unpleasant job of getting out and tidying it all up before it causes injury to people and pets, or damage to the wildlife. It is sad that our council tax money has to be used on this job, because if people had the basic decency to take their rubbish home with them or dispose of it properly, there would not be a job for them to do in the first place.
What should have been a relaxing walk for me ended up not being great for my blood pressure.
I just can't understand the mentality of people who can be this inconsiderate and stupid. If any of them are reading this, I hope they feel ashamed, but I doubt if they have the imagination.