1 - why would someone actually create this; and 2 - what do they hope to achieve by sharing it
Facebook is so bizarre, I just don't understand its purpose.
People create these things to feel better about themselves; their "good deed" for the day. Social media is a platform for self-promotion and expression, regardless of whether anyone is listening or paying attention. Its public virtue-masturbation at its most fundamentally selfish and gauche. I always think of this image in response: