They have not suddenly gone mad

It was a performance of high symbolism. About 200 activists gathered on a popular beach in Mallorca, Spain, to protest the effects of overtourism on the environment, on rent and prices in general, and on their daily lives. On this small beach, a cove with emerald waters, 4,000 visitors and 1,200 cars arrive every day to take a photo and post it on Instagram. In videos posted online, locals can be seen shouting at foreign visitors to "go away, go away!" This particular protest was the latest in a series of demonstrations being held in Mallorca for the same reason.

In Greece, we may not have similar incidents, with locals shouting at tourists to "go away," but dissatisfaction has been expressed on several occasions. Last year, various movements, such as the Citizens' Movement for Free Beaches of Paros, which was widely supported by the public, expressed concern about what...