That might be the case in your country, but there are many cultures that are perfectly capable of sharing and keeping common infrastructure in good conditions. Your personal experience isn’t generic and globally true.

A country’s land should not be owned by individuals, in my opinion, but used by those who need it and when they do so. A country’s land is what makes it a land, so it cannot be owned or sold. Someone inheriting it from someone who took it and maybe sold it should give no legitimate claim to possession.