Most common way to lose in low ELO

I'd say about 60% of my losses come from my team actually dominating during laning phase. Most times coming out of it with a double digit kill lead and all of the first tier towers down. Then what I call low elo cancer begins to manifest itself. It's this culture of thinking they are invincible and diving in 2v4 or 3v5 non stop. Not warding anymore. Building stupid stuff. This happens slowly for about 15-20 minutes until we are so completely behind that the enemy team just steam rolls us. I have no idea how to combat this. I've tried being helpful, I've tried being mean, I've tried calling shots. Nothing helps. And I know what people are going to say, that's just league, suck up your loss and move on. But I refuse to accept that. Most of the time I lose it's to this stupidity. And it's the most frustrating thing to have to watch it for 15-20 mins. I'd almost rather come out behind of lane phase or even, because then this seems to happen a lot less often.