What do you think?
https://www.psychologytoday.com/blog/feeling-our-way/201401/punishment-doesnt-work
https://www.sciencedaily.com/releases/2017/07/170704093910.htm
http://www.apa.org/news/press/releases/2002/06/spanking.aspx
http://gdcvault.com/play/1017940/The-Science-Behind-Shaping-Player
http://www.gdcvault.com/play/1020389/Enhancing-Sportsmanship-in-Online
http://www.gdcvault.com/play/1022160/More-Science-Behind-Shaping-Player
Please don't downvote. If anything is wrong please give me a link and I will edit it into the original post.