I don't mean to continually agree, but you are correct - it all comes down to your own judgement about whether you trust the person or not. Similarly, there are those who I wouldn't trust. That being said, I don't necessarily have mistrust for someone I don't know, until they prove otherwise. In the end, it all comes down to the fact that the only true locality alterna are the ones that you have picked up from the wild with your own two hands.