In many decades of UAP sightings, there has never been any indication of intent to harm. It may or may not be there, but so far we’ve never seen any harm from sightings.
Scares? Yes. Harm....no.
Until that happens, I see no reason for concern.
I believe they are from another dimension (a spiritual one) that can become visible in the dimensions we live in.
They cannot be physical devices for they exceed the laws of physics.
Aliens? An Alien visited our planet 2,000 years ago. His life and character were not of this world. He too defied physics. He was rejected and killed. But He returned in a resurrected body that cannot be killed again. He lives.....and is the Creator and Ruler of our universe......
And He is coming back. To claim what is rightfully His, as He created it.
They cannot be physical devices for they exceed the laws of physics.
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Yep we now know all the laws of physics - just a few small details need to be filled in, scientific consensus in the 1950s.
Human hubris knows no bounds
Significant mental anguish and scarring. People abducted from their beds and automobiles in the middle of the night. Subjected to medical experimentation of a mostly sexual nature. BTW, it almost always runs in families (for generations).
And then there are the missing persons in cases related to sightings and abductions.
You've heard of animal mutilations of course. Did you know that there were (apparently) human mutilation cases that were hushed up by the military? Bodies found with parts missing, having been removed with laser precision.
Bottom line: We don't know enough either way to form solid opinions about our safety or the lack thereof.
One more note. Dr. Garry Nolan of Stanford University Medical School was drawn into the UFO field by the CIA who wanted him to determine if possible why some of their men who had come into contact with UFOs were developing a variety of life-threatening ailments like brain lesions, tumors, and other abnormalities. Not exactly safe.
Note that comment in the previous paragraph. The CIA had men come into contact with actual UFO craft. Garry Nolan has been given permission by the CIA (presumably) to discuss this matter publically. And he has done so on record.