Former naïve Good Samaritan here who has learned to be a lot more circumspect. I have Baggage on this topic. I have deleted a multiple paragraph rant about all my Baggage. (You are welcome.)

Good Samaritans who have been burned enough learn to pack a cloak of invisibility for survival purposes.

That doesn't prove they aren't nefarious actors, but their cloak of invisibility is also not evidence of nefariousness. It might just be evidence that they have been around the block a time or two and have gotten a clue about a few things.