Why are there so many smurfs in bronze/iron like my last few games of comp I’ve had gold and plat players who’ve been throwing the game for no reason it’s so annoying I’m trying to rank up but they just want to throw the game

I just played a casual match and my team literally got fcked by 1 person. I‘m level 24 and I’m not so good yet because I only played games like cod on console before. We lost 6 - 13 and the lvl 8 guy was 41/8/4 an I got 22/14/2 and I was t...