Ego-fights between teammates, lack of effort and training professionally, underestimating strats and overestimating aim, thought of killing more in ranked makes you a better player and it goes on...
Might be true. Because most of the Turkish players above Diamond/Immortal have the same mindset: "Look I kill more than you so I am better!" "We are only losing because you couldn't kill more than 10!" "I just press W and tap on the heads therefore I am the best player in the world!"