I dunno. I used Market Place yesterday to get a new dry erase board (new to me). And, many people use FB to communicate with friends and family. How is that working to make the world a worse place?

Things can be good for you personally and still make the world a worse place.

No idea. There was once this German guy who planted flowers in front of factories. His name was Adolf Hitler and I'm not sure why everyone hates him so much. (This is sarcastic and do you see the problem with your comment now?)