Though these reported Navy UFO's don't bother or attack us, they aren't entirely passive either. There is some interaction (in the USS Nimitz event, they reacted to the jets).
But they don't attack either and they don't seem to be trying to get a conversation (of any kind) going.
Given that, I would say that whatever is being witnessed isn't a threat and indeed might be some kind of heretofore undiscovered earthly phenomenon. Maybe it's alive or maybe it's a natural phenomenon that gives off energy (electrical or electromagnetic perhaps) which causes it to act the way it does.
Of course, there is always the possibility that it is a function of something alive and sentient. I just haven't seen any evidence of that so far in the Navy observations disclosed.
Many years ago, in a UK UFO aerial observation IIRC a military jet actually fired on a UFO (and missed). Nothing happened and there was no return fire.
As an aside, in my experience, the most troubling of all the UFO/extraterrestrial/interdimensional stories are the abduction experiences studied by Dr. John Mack of Harvard, Dr. David Jacobs of Temple Univ, and Budd Hopkins. Those doing to studying are solid and credible, as are their methods of analysis and conclusions. And those being studied are credible if greatly traumatized.
As Mack said, he isn't quite sure "what" is going on, but he IS sure that "something" is going on...something frightening.
If the Navy et al., are going to such trouble, it would most likely be something significant (otherwise, why the bother).