[No one involved in the butchering of tens of millions of mostly gentiles in the Communist Holocaust were charged (a disproportionate number of whose butchers were Jews).]
"To stay alive"?
For Jews, there is never justification for any crime done against Jews. Yet apparently, many justifications for crimes Jews commit against gentiles.
... and prevent the resurgence of the Whites who killed them at every opportunity?
"At every opportunity"?
Exaggerate much?
The Tsar wasn't that bad. Nikolai Tolstoy (Leo's grandson), in Stalin's Secret War, wrote that the Romanovs had executed a few thousand people during their 300 year reign. The Bolsheviks executed hundreds of thousands in only the first six months.
In the Russian Civil War, the Whites were the good guys, the Reds the bad guys.