This thread is very in-depth (as threads go). And I congratulate you on having written this out thoroughly.
I think it is essential to keep morale up on one's team, especially in games that need a bit more cooperation.
I remember a game I was playing where we were losing 10 to 30 or so. We all thought the game was going to inevitably end poorly. That is until our Jarvan IV told us to follow him to victory. We followed behind his manly stride as J4 initiated against the enemy team, and together we killed the enemy team, took Baron and proceeded to destroy their Nexus.
Ever since then I try to keep a positive attitude and spam Laugh when I play Singed.
However ZingerOTPeople, I don't agree with your strategy of being rude to the enemy team. Demoralizing the enemies so that they start bickering is a great tactic, I have used it. Spamming laugh or taunt is fine, but being rude is uncivil.