I get my information from numerous sources. Those sources include my own experiences (3-1/2 years of ongoing interactions with BF); the experiences of friends and acquaintances who have had many more years of positive, rewarding experiences with the BF people than I've had; and the report record.
There are more than 46,000 reports of encounters in the BFRO database. That means 46,000 people had encounters and lived to report them. (If the BF were aggressive, dangerous beings, we would have 46,000 dead people, instead of 46,000 reports.) There are many more reports that the BFRO has not published, for whatever reason, which would bump that number even higher. We also know that many people do not file reports when they have sightings. So again, the number is still higher.
And finally, the presence of a BF is extremely difficult to detect, if the BF does not want you to know he or she is present. (I – and many others -- have personal experience of this.) So the likelihood that your average hiker/walker has unknowingly been shadowed by one or more BF on their jaunt through the woods is extremely high, again adding to the numbers of encounters that have resulted in zero harm to anybody.
That’s a loooooooot of people who were not killed or hurt in any way while in the presence of a BF. So that's a lot of BF who were not "mean". (This includes the BF who shake trees, scream, and run at you. They're not "mean", either. They could squash you like a bug, but they don't. They just want you out of there, away from their families or their hunting spots or their bedding spots.)
The "large number" of reports of BF who "aren't nice" is as a drop in the bucket, compared to the many thousands of reports that say, "He looked at me, then turned and walked away."
And finally, there are the many studies that show that the observer changes the thing he’s observing – meaning, perception is everything. If you find yourself in a face-to-face encounter with a BF and you decide to be afraid, you will burn into your own soul the impression (very likely false) that you were in danger in that moment. If, however, you decide that you are NOT in danger – that you are in the presence of another thinking, reasonable being like yourself – and you therefore treat that being with the respect he or she deserves, you will have a very different experience.
And just as a side note, many people have encounters that are traumatic to them at the time, but then over time, these people come to understand they were never in any danger. These formerly traumatized people become really interested in learning more about the BF and often dedicate considerable amounts of time and money to that effort. These strange reversals would not occur if it were not true that the BF are, in essence, reasonable, kind, decent people. It is the growing awareness of their true nature that piques our curiosity and leads us (or most of us, anyway) to want to know more.
So, good luck to you in your investigations. I'm glad you're not afraid. That's 90% of it. Be respectful of these people (which it sounds like you are), and have fun!