So sick of the stupidity in ranked

Basically the title says it all, 90% of you are pretty much brain dead when it comes to this game. It's truly a marvel to watch. I've reaffirmed this recently after having the most frustrating game I've had in a long time. So we are winning, I'm making good ganks, people are listening to my pings etc. But wait! There's always the midlaner that thinks he's a pro player and loves to stay in lane with less than 100hp! And to add onto that, I just gave him blue. I warn him and tell him not to get Cass blue, he stays and dies, cool you're stupid.

The game goes on and we start winning again, I make a couple more ganks, I make a great Baron call at 22min and we get Baron.

Well this mid laner's arrogance takes over again, because he's stupid, and he overextends and gets picked off after I warned him not to go, cool, you're stupid.

Some time goes by and we pick off their jungler right at Baron, so I'm pinging to get Baron over and over and over. But the midlaner is like nah, I'm gonna chase their team! And my team follows him, right into 4 barrels from GP, we lose the fight. Cool, you're all stupid.

Some time goes by and their top and mid inhibs come back up, so I ping for us to group and push top so we can rotate is need be, maybe have our top lane split bot. Well, everyone listens except this midlaner, who just REALLY wants that outer turret in bot lane. My team groups mid so I ask our midlaner to join us mid and help us get inhib because we can't without him. NAH IT'S K!!! Outer turret > Open Inhib!. So we wait for like 2minutes and then our adc over extends, and gets caught out and we lose the fight.

My EXTREMELY INTELLIGENT MIDLANER then says, "Why would you engage?! Stupid Jungler."

I mean, what is the deal. This is like Plat 5 (I'm guessing, still in provisionals, the midlaner was Plat 5 so), why is the common sense stuff so uncommon. I mean why is he so arrogant, he's the one person on the team who isn't on the same page. WHY does he just become the biggest idiotic stubborn pile of garbage.

So my question is, why are all of you so dam stupid in ranked? Why? In what world is an outer turret > open inhib? I mean, is League strategy just a complete lie? You win the game once you get all the outer turrets? Is that the new endgame? Why even have a Nexus? Or let me ping? No one listens, and I'm tired of it.