If that's your only criteria, the US must be the worst of the lot for ethnically cleansing an entire continent to claim it.
I grew up in the 90s and remember the ecstatic cheering when Bangladesh won its first cricket match. The decisions that led to that genocide were topdown driven by a racist military brass, not ordinary people who were told that all the fighting was against India.
Of course that doesn't excuse the genocide and everyone who partook should be treated no different from a Nazi but you can't lump the entire population in with that.
"3,000,000 people were killed during the genocide, making it the largest genocide since the Holocaust during World War II" https://en.wikipedia.org/wiki/1971_Bangladesh_genocide.