Why this lack of respect for nature - Balmedie - Scotland

Balmedie beach is an amazing place located a few miles north of Aberdeen. With a large area of sand dunes, the Balmedie Country park provides a large range of installations and activities to make this area extremely enjoyable. While the sand dunes are a very popular place for BBQ, some visitors decide to ignore the rubbish bins and prefer to leave the litter on side. Why do they have to come to a beautiful place like this and spoil the area for the other visitors??? Some should have a bit more respect and consideration.