Riot, you done did it this time (Behavior in PROMO games)

So I'm in my 7th promo, and I was feelin' good because the next game won would promote me to bronze 1. Then, boom, the Mundo top afks at 10 minutes. At this point his enemy laner, a vladimir, was 4/0. You can imagine how it went from there. So then I was like, ok Riot, I know you expect us to be able to win even when our only late game scaler is afk. I was kinda tilted at this point but then I read on Reddit that Riot expects you to win anyway and I figured that makes sense in the same way Riots sick and twisted ban system makes sense. Then I hop into my next promo game, I was lulu supporting a jinx. 10 minutes in, the trundle top afks. 15 minutes in the fizz mid afks and the amumu jungle afks. The amumu had given 2 kills to the enemy jarvan making him 2/1 and the fizz had given 4 kills to the talon making him 4/0. At this point the two of us had 3 afks on our team, an open mid and top, and a free jungle. But I didnt give up, it was my 8th promo and I'd be damned if I was going to let 3 goddamn afks stop me from promoting to B1. WHat happened? They got cocky and jinx got a double when they dove. THen she went top and killed garen. Then they collapsed on the two of us a few times so we traded kills. THe jinx and I both had a positive KDA, and were somehow holding 3 inhibs up on our own. But it was not enough, they took baron and drake, ran it down mid. There was only so much the two of us could do in midgame against a Garen with 4 items, a Jarvan with 3, and a Talon with 3. So we lost, obviously. Then I'm like, OK Riot, I got 3 AFKS, is that enough for you. Apparently It wasn't and I got placed Bronze 2 with 84 LP. This tilted me out of my mind. RIOT the whole point of promos is to place people where they should be and if I have 3 ******* AFKS IM NOT GOING TO BE WHERE IM SUPPOSED TO BE. Someone explain how Riot expects me to carry 3 goddamn afks. Even Professor Akali, who is challenger, against 5 silver players needed 2 others players just to hold lanes. I don't understand how they expect me to do the same as a support with a jinx not even close to lategame. Please explain yourself Riot. EIther that or give me another promo, im tilted out of my mind.

EDIT: THe game only went to early game and by 4 items i do not mean 4 finished items mb kinda vague

The three had 1 finished item each