Graffiti is too often equated with vandalism, because graffiti art is actually an art that is purposefully placed in a space. But like elsewhere, this is also used for bad purposes, for discrediting, for destroying property, etc. And since the media emphasize this side more than the artistic side, public opinion is what it is. But it must be admitted, even if graffiti is not a work of art, it can be a fun urban addition in the form of vandalism.
If you imagine a "vocation" graffiti artist, his workday looks something like this. He finds a location that is as crowded as possible and tries to leave his message, manifesto, whatever, without anyone noticing, of course. That's why they work at hours, when the city sleeps, but since the hand of justice does not rest, the schedule also includes a lot of running. But without them, many cities would be desolate, without a soul, and the examples in the gallery only confirm this.
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One final thought. Because graffiti is a medium with which the author wants to achieve just that with his message largest audience, it would be interesting to do a study if it is after the occurrence "the wall" on Facebook, the number of graffiti in cities has decreased somewhat.