Fair leave?

So I just had to leave a game, after the three members of my team left, so would have been me verses four, and I didn’t feel like letting my stats take a hit, , so how come when I leave the game, my CSR goes down, and I get a canage report for the game?

Yeah, that’s one thing I would love to be added into the system but even if you didn’t leave your CSR would go down anyway. A Mercy option to end the game early would be the better option here.