How do you prevent your team from throwing?

So it seems like my teams always throw the game. It's getting really annoying. The worst part is, they always throw in the worst and dumbest ways possible.

Here are just some examples of the recent ways my teams have thrown: -Zed sitting in jungle pinging Baron when we aced the enemy team. Had he been there to kill (he was fed), we would've killed the Nexus. Instead, Amumu comes out and ults us and we lose the game because Zed spam pinged Baron while the enemy was down and we were killing their base. -Yi running straight up lane thinking he is unkillable. Tries to 1v3 and instantly dies. -A team that just simply decided that a 5v4 is a guaranteed win and decides to mess around after getting a huge lead early. Diana catches my teammates roaming around trying to "farm" enemy for kills, or just running around in the jungle instead of pushing for the enemy base. Yeah, a 5v4 that we lost. -The Inhibitor Throw - Our fed ADC Ashe is dead, enemy Fizz is fed, yet my team decides to engage in a 4v5 in an attempt to stop the enemy from killing the inhib. 3 of them die, Inhib also, and we lose the game. Do people seriously believe the Inhibitor shoots missiles like turrets, or do they just think they absolutely have to save an inhib? -Another Yi, starts off strong, then believes he is unkillable and continuously tries to engage in 1v3s (Doesn't this sound familiar?). He did this about..uh 7 times? Enemy Fizz got caught up and eventually the entire enemy team as well. So he starts something like 9-4-5, finishes 12-13-8.
-A Jax that decides to leave the team and go farm the jungle. Instantly gets caught chasing the Rift Scuttler near drag. Dragon wasn't even going to be up for another 4 minutes. Same game, he chooses to solo Baron while the enemy is in our base. Then he engages in a 2v5 when the rest of the team was about to come up. -Team decides not to try to take enemy base when there were 4 enemies on 40+ second respawns. We had our entire team up. The enemy then comes up, and oh yeah.. the Baron Throw. Wukong and Thresh choose to do baron alone, without our adc, without the rest of the team. Janna comes over to place a ward, followed by 2 enemies teleporting in, and even then, they choose not to try to escape but instead to finish baron. They miss by a good 1500 hp on the Baron and both die, enemy takes baron, then my 2 other teammates choose to try to steal and both die. I was unable to stop the enemy in a 1v5 in our base. -This happened about 4 times, a team that focused enemy Shen or Thresh and lost team fights over and over again.

And that's ONLY 11 or 12 of the 25 times my teams have thrown in ranked.. out of my 94 losses in ranked. More than 1/4 of my losses come from throws. And that's not even counting the 15 more times where my team almost threw. Seriously, how do you stop your team from making dumb mistakes like the ones I listed above and throwing the game? And the worst part is, it's always my team, never the enemy. The enemy always knows who to focus, the right time to Baron, not to dive into 2v5s. WHY? WHY? WHY?

And also, why do you think I remember all the details? Because these all happened recently.