IMO, there are four basic camps of people associated with this endeavor:
You have those individuals that have experienced a personal encounter with these beings and are able to reconcile with themselves that what they experienced was indeed a real event by means of supporting evidence left behind as a result of the incident. In other words, they know and they know that they know.
Next, are those that think they may have experienced an encounter but because of a lack of supporting evidence they often have nothing but their own memory visualization to rely upon. This group is often some of the more ardent enthusiasts as they seek validation from a variety of sources to help substantiate their experience as being genuine. People in this class often have sightings (while driving, etc.) that they cannot easily corroborate with other forms of evidence.
Then, there are more or less casual observers of this endeavor who while interested are not inclined to pursue the endeavor with any degree of skin in the game. They often associate with BF groups but in more of a cheerleader role or one of more an agnostic position.
Finally, come the skeptics whose fear of losing face precipitates a mocking mentality fraught with negativity. Unfortunately, they often gravitate to places where others of the same mindset habitate but
end up simply carping among themselves and losing all appearances of relevance.
I have yet to meet a skeptic that had also experienced a personal encounter. On one outing, a skeptic was in our company and while not belligerent or caustic, he made it clear he felt we were all full of
bovine caca. That is, until that evening he observed two of these beings at <50 yards through a set of Gen III NV binoculars. His transformation was immediate and complete.
The gist of the matter once you have that encounter, there is no longer any doubt. If you aren't actively seeking such, to which group do you belong?