They could just be making observations and taking measurements. Maybe they don't want to interfere and are more interested in studying our development. Or mayb

They could just be making observations and taking measurements. Maybe they don't want to interfere and are more interested in studying our development. Or maybe they are scouts that were sent all over the cosmos for the purpose of exploration and they will report back their findings to their home eventually. There are plenty of rational explanations for their behavior, especially if we are extremely far behind them in our technological development.