Rage Quitters Never Get Punished

The past 4 ranked games I have played, my adc's (yes, it is ALWAYS the adc) feeds, then rage quits. Now, I'm an Aurelion Sol main, and I roam bot very frequently, getting them ahead, trying to help them win lane while my jungler mostly helps out top at times I can't. Because I'm in silver, as many of you can relate, all people care about is what their KDA looks like, they want all the kills, and I've experienced that even when an adc is low health, they will run apeshit into the enemy trying to get the kill, resulting in them dying. "What a ridiculous idea" I'm sure you're all saying to yourselves, and right you are, but for some odd reason, Silver players will blame YOU for them dying in those circumstances. How odd? This is where I get to my point. Our adc will rage quit, typically this happens around the 6-10 minute mark, and y'know we won't always just ff@15, because a comeback is always possible, but what I'm angry about, is that none of them seem to get punished, at all??? A leaver buster is just a "slap on the wrist" that doesn't address the issue at all, and I never get instant feedback reports. I'm just trying to climb back up to gold, I'm a regular player, I tilt sometimes, but never to the point of flaming, inting, or going afk, I just simply play the game out the way I roll, but its extremely hard to climb when you're in a constant state of 4v5s, doesn't matter how well you're doing, a disadvantage is a disadvantage. The reason I feel they never get penalized for their actions is because this happens to me so frequently.