I understand where your coming from and maybe a minority of the numbers are PIMP's but I'd just lie it on the fact that manners as a whole has gone in society, very few people acknowledge you when you let them out a junction, very few people thank you for holding the door for them, very few people will put others over themselves.
It is society as a whole now adays, it could be a number of reasons why people don't show up to appointments, but there is usually one reason why they don't call to cancel, and this is plain ignorance, out of sight out of mind sort of thing.
You may not agree with me, but surely you understand what I mean
“Nothing is more creative... nor destructive... than a brilliant mind with a purpose.”
― Dan Brown, Inferno