Do not covet your neighbor’s house. Do not covet your neighbor’s wife, male or female servant, ox or donkey, or anything else your neighbor owns.”
Communities can bring curses on themselves by stealing others properties.
No, they read the 10th Amendment: "The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people."
In the Kelo case the court refused to overrule the decision of the Connecticut Supreme Court that found the legislation authorizing the use of eminent domain in this case constitutional. Now we can argue the wisdom of that decision all day but good law or bad law the 10th Amendment gives states the right to make it. And absent any clear violation of the U.S. Constitution the U.S. Supreme Court shouldn't overrule them.