feeding team (vent)

So the past few days I'm climbing through bronze, hitting a nice 4 then 5 win streak. Well then I start playing today. Each game, yes each game today I get a teamate that dies within the first 4 minutes of the game. Then they proceed to push through middle of their lane trying to fight the guy again dying once more. this usually goes on 2-3 more times until the enemy is at a point that they can tower dive them and kill them. which then my teammate goes on to say "I WAS UNDER MY TOWER WHAT DO YOU WANT ME TO DO?!?!" and all i can think is 'well I wanted you to not try to fight him after the FIRST time he killed you" I am usually a calm gamer, no matter what. but I made it into my b3 promos, lost and now I'm back in b4. This is beyond frustrating. I have taken in a lot of lessons this past week and I feel it has been showing. I made a good climb the past couple days and then these games happen. I am in Diamond rank in Starcraft 2, I refuse to believe that I am so terrible at this game that I am the sole reason I'm stuck in bronze. I work with my team, I take notes, I don't blame anyone on my team ( and if I do I don't voice it in chat) I take responsibility for my actions/stupid plays. But when I'm in laning phase up top and my bot dies 4 times, tilting the rest of my team I feel completely helpless. Yes I'm in bronze but god have I seen some stupid people today. There should be a league under bronze, this is a terrible division to be in.