As a means of building trust...the same reason we hold our pets at all? They are essentially wild animals who rely on instincts, but they certainly do learn
that they are safe with us. I say this as one who interacts with the public with my snakes for educational purposes, & as one who has never had a snake
bite or act badly during any such program or "meet & greet". In my experience, the trust my snakes seem to feel when handled apparently carries over
to total strangers, which is exactly what I want & what they need: good public relations