I mean, to make that argument about the holocaust you'd need to lie about the numbers.
There were 17 million Jews worldwide in 1939, but only 11 million in 1945. In Europe, the population went from 9 million Jews just before the holocaust to only 3 million Jews continent-wide after it - even counting those in allied and neutral countries.
Poland, before the holocaust, had over three million Jews; 90% of them were murdered by the Nazis. Those people didn't just evaporate.
Meanwhile - did I lie about the numbers? Keep in mind, 2 million is the current number of Israeli citizens of Palestinian heritage.
The US parties are weird.
Because there's no PR, anyone who wants to be effective has to join one of the parties. Because of that, diversity in each party is way higher than you see in places that use party list PR.
For example, the Democrats have both Alrxandria Ocasio Cortez, who describes herself as a democratic socialist, and Joe Manchin, a fairly conservative former coal exec from West Virginia.
The real interesting bit of American elections tends to be the primaries, where all the voters registered with a party vote on who their candidate should be. Alexandria Ocasio Cortez got elected because she defeated the incumbent Democrat in the primary.
In 2020, everyone from Bernie Sanders to billionaire Michael Bloomberg ran in the Democratic primary. There was some real choice there until Biden won and it became just Trump vs Biden.