Mr. E, I love what you had to say.
I have lived in two foreign counties (Germany and Saudi Arabia) for a total of 9 years. Also, visited 83 foreign countries and enjoyed them all.
Regarding this comment by MarkK:
A main problem of human beings in mass tourism is that everybody optimizes his own benefit only
I know that people generally act in ways that is in their own benefit, however, how people act around others is a mixed bag.
Example, traveling with a group of people on a tour, even a those day tours of a multi-day tour for several days, I find the vast majority of people are not so selfish that they inflict difficulties on others. It has been my experience that most seasoned travelers are not rude or impolite. Sure, I remember a couple of people that were ill and should have taken their sneezing all over our dinner table, or the individuals that were 15 minutes late arriving at the tour bus, delaying everyone, but that has been the exception not the rule.
It is true that civility is not what it was 40 years ago, but depending on the culture, it is still good. The one notable issue that I have seen is touring with people from China, that don't know how to queue up in line or not block others from taking photos for inordinate periods. I understand, having been to China just how crowded their cities.
As for people maximizing their travel opportunities, I understand that, I love to travel and understand that crowds can be larger than they were in the past. Still, I have found that if I make my travel arrangements doing in depth research and planning that minimizes frustration.
Sure, renting a car at Heathrow and getting on the London orbital, I can expect to find a parking lot. So, I find a way to avoid that as much as possible. If I want to see a popular venue, like the Anne Frank House in Amsterdam, I book as soon as possible.
Of course, experienced travelers should know that in many European cities like Barcelona, Paris and Rome that pickpockets abound and not to protect your wallet and passport is a huge problem. Yes, greed is a part of the human experience, but the vast majority people, travelers and residents are civil.