Leaving dog at campsite

I can not understand people who leave their dogs in cars during summer or when it is very hot or cold outside, they can die. Why did they buy a dog if they don't care of them? I have a dog and I take care of him and when it is possible I always bring him with me, only once left him in the car for 7 minutes but with air conditioning, because I was worried about him. Moreover, I try to feed him with the best food, I always buy from ***Link Removed***https://woofbarkgrowl.co.uk/wainwrights-dog-food/, because it is based on natural ingredients and my dog likes it a lot. By the way, my dog's name is Ricky.