The Tsarists were only one part of the White movement. In reality, it was just a coalition of anyone broadly right of the Bolsheviks, ranging from "DemSocs" (Mensheviks and left SRs) and SuccDems to Monarchists and Pogrom-waging Reactionaries/Protofascists. Should come at no surprise SuccDems would rather throw in their lot with fascists than Communists.
The Tsarists were only one part of the White movement. In reality, it was just a coalition of anyone broadly right of the Bolsheviks, ranging from "DemSocs" (Mensheviks and left SRs) and SuccDems to Monarchists and Pogrom-waging Reactionaries/Protofascists. Should come at no surprise SuccDems would rather throw in their lot with fascists than Communists.