Sure, ICC just needed to tell the umpires to start the match as soon as the rain stops. And do not care about the wet outfield. Who knows they may have ordered to play in the rain too if the rain would not have stopped.
Do you know that when the field is wet it favors the batting team? So who was batting at that time? It was Bangladesh batting. So the condition was favorable for Bangladesh.
If you do not remember, in the last world cup, the formula was to win the toss and bat second. Why? Because there was dew in the second half and bowling was not easy. So can we say that umpire favored Bangladesh to allow play in a wet outfield making it difficult for the Indian bowlers to bowl?
What if, India had lost this match, would the social media scream that it was the umpire's decision making India lose
Finally, you are forgetting that India made 180+ runs. How many times 180+ was chased in this WC? I think not even once, so how come you think that India won with the help of umpires?