Why aliens annoy us?

This time I write about hypothetical aliens again, and here is one of the best questions that has been made about alien behavior. The question is about the behavior of the UFOs. There is a possibility, that UFOs are something than we ever expected. And before a single of those UFOs is captured. And taken to the research laboratory, there is no answer for their origin. 

And are they manmade or created by alien civilization the question is, why those mysterious crafts are trying to annoy people like fighter pilots? Is the reason for that mysterious behavior of the unknown craft something that we ever imagined? Do those crafts collect data about the abilities of jet fighters? 

And do the operators collect same time data about the communication? By connecting the data about the reactions of the jet fighters and communication the operator can try to break the tactical codes of the jet fighters. The fact is that there is one very interesting explanation, why those crafts are not shot down. The explanation is that those crafts can be holograms, where the air is also ionized. 

The hologram and ions are making it possible to make a perfect ghost that cannot shot down. Those holograms can project to air by using satellites or high-flying stratospheric aircraft like TIER-2 Global Hawk. The system can observe the movements of the hostile aircraft, while they are hunting that ghost. 

Another explanation that people are not ever seen crash-landed UFOs is that those vehicles are made by using nanotechnology. In that kinds of systems, the craft is made by using nanomachines which are like microcircuits.  Or autonomously operating Lego bricks. When the craft is damaged. Those small Lego bricks are removing contact and the entire craft is turning to dust. 

Each brick could be autonomously operating and operated by a cloned neuron. But the fact is that humans can handle this kind of technology. So that kind of technology is not necessarily coming from extraterrestrial intelligence. Things like alien hypotheses are the most interesting things in the world. 

Some people are earning their paycheck because they are modeling and thinking about the possibilities, what some kind of hypothetical alien warcraft can look like. Then they are trying to model those things to some aircraft, ships, or ground vehicles.