Civilization 5 Sometimes the enemy comes back to my site to rob things, why can't I rob others?

It will reduce the goodwill. But don't be too concerned about the decline in goodwill here. Your own interests are the most important. This situation is usually that your enemy pays a lot of money for your ally to act as a mediator, which is rare when playing computer.

Looting can only get a little money and make the existing facilities in this grid useless (the other party needs to repair, but it takes much less time than building this facility). Unable to get resources for this grid.

In addition, it is easy to understand that "you will get the resources that this city-state has connected to nearby", that is, you will get all the developed strategic resources and luxury resources of this city-state. But sometimes the polis does not build facilities on resources. These resources are considered as unconnected resources, which can only be obtained after the polis has built facilities, or invested in the polis as a gift, so that the polis can immediately build the facilities needed for these resources. This has nothing to do with whether the territory is connected or not.