I’m pretty sure most people are happy to help. Every time I’m photographing in our local state parks, visitors ask me about local places to see and I usually learn something good about their hometown.
If you expect negative you’ll get it and if you expect positive then they will be there.
Worked the Christmas rush in a large department store. The best was when a sweet grandmother searched to find me because I was the height and build of her grandson. Sold her a nice blazer. Met many nice people.
There is no cause and effect proof necessary to list a “possible” side effect. As I understand the process, people in the pharmaceutical trial merely list what they experience during the trial. Can certainly be coincidental.
Lot easier to draw.