Taking a picture, of you, or just an `identical` is not why people travel. It's just the most easy way of documenting your visit and a way to have something from that place without actually taking something from that place. Literally the best way to leave no footprint of your visit and be satisfied, but for some reason gatekeepers hate it.

Some people travel to meet locals, some people travel to watch sports, some people travel to just lay at the beach and feel the breathe, some people travel to try the food, some people travel to jump around museums and sights.

Nothing wrong with any type of travel, unless you're trying to brake local laws or disturb locals (those who try to meet locals no matter what could do that and not even see what they're doing).

For some reason westerners are not able to take easy loitering. Maybe because it's illegal in some states or countries, but in most places around the world it's perfectly legal. If you want to just walk around San Marco square, there's no one stopping you, even if you live in Slovakia or Mexico, or Canada. And there should not be anyone stopping you. It's a public place, it's there for everyone to enjoy. If local authorities think they're unable to maintain infrastructure, they still will be fine after implementing a city tax for visitors. But the nature of public spaces should and will be untouched.