[Crazy Jetty]

Our galaxy is a medium sized galaxy that consists of around 200 billion known stars. And there are somewhere like a hundred billion known galaxies in the universe.
It is arrogance in the highest order for anyone to believe that we are the only life in the universe. So it's not a matter of believing in extra terrestrials. They are statistically and mathamatically there.

Do I believe that aliens are visiting earth and abducting people? I don't know. It is almost impossible as we know science and physics.
But we also don't know everything about science and physics. So I have no problem accepting that a race that advanced has a means to get here we don't understand.
So the question becomes more in terms of why.

I think if there are "aliens among us", the majority of the "visits" have no malicious intent. We're extremely basal animals to them.
In our own world, we go out in our boats with our fishing lines. We catch a shark, we pull it aboard, and do medical exams on it. We draw blood from it. We do all sorts of things to this terrified little animal. Then we jam a device under it's skin we call a tracker, so we can either find it again, or recognize it at a later date, and then we release it.
The shark has not suffered physically and is no worse for wear, but now has a tramatic story in it's life.
We do this all over the world, with all sorts of animals we want to study, using boats, cars, helicoptors.
Most of these alien abductions really sound no different than what we do to our own wildlife. Or what we'd do to alien wildlife if we managed to get out there.