actually, you can sue any one for any reason. There are a number of resons that the judge then dimisses the law suit. Usually they would say it lacks merrit. Sometimes the issue is moot, because the problem is now gone, or they say it isn't ripe meaning the problem doesn't exist yet. They can also dismiss the suit because the plantiff lacks standing. You can't sue MacDonald's for makeing some one else fat.
Now I need to go paint de fence.