Why not an S rank ?

I have a problem and it always happens to me... when i play a champ and get 9/2/1 or 10/1/2 in 21 or 22 minutes because the enemy team surronder and played as hard as I can I didn't get any S... It's not my fault if the team surronder at an early time... if in those games the team didn't surronder i would probably get 18/2/2 and 20/1/4 or maybe more... why is that ?
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