Aliens could end up in 3 general categories. Mutual, Defensive, and Offensive. Offensive aliens would be out searching the universe in the best interest of their species and do anything to preserve their species at all costs. Offensive/mutual sub cat. - Treat us as companions and help each other or use us as slaves somewhat. Mutual aliens would Research us, maybe trade resources for knowledge with us. Give us knowledge. Help us. Mutual defensive. - They would try to give us hints and Little information hoping we would learn from it and change. Defensive aliens would only research us but try to keep their presence hidden. Seeing us as a violent war prone species they would be vary wary of us and our religious views. I believe the universe is so vast their could be all those types of aliens is our solar system. Although our planet has probably never made contact, our governments were hiding it they would be doing a better job at that than anything else they do.