The questions can be answered with enough investigation and research no doubt.
I suppose the first step is to determine as best possible exactly what IS being seen....and not just settle for a mere description.
If multi-sourced data is available....it seem linking the evidence that will confirm or deny the "seen" UAP's are either a naturally occurring phenomenon or being caused by a man-made cause.
The other possibility is what makes this such a challenge as we here on Earth take it for granted that we are gifted ones in all of Creation.
There is a lot of other places we can only hypothesize about that if they exist....our imagined importance is going to take a huge kick in the pants.
But...first let's examine each of these occurrences using ever means possible to see if we can find an acceptable scientific explanation for them.