Why the hell are promos like this?
To put it blunt, it's like Bronze vs Diamond in terms of team coordination and attitude.
There's always that one asshole who dies once, blames jungler (or support if they're the adc, or the adc if they are the support) griefs the entire game and sometimes even intentionally feeds or AFKs on purpose.
Do you have these type of players on stock just to make promos more hell than it has to be? Cause that's definitely what it feels like.