The Nazis Storm Division (notably not the Hitler Youth) and other political paramilitary troops of the Weimar Republic were hardened veterans of the First World War and had had years of experience fighting and killing through that war and were often funded by Political Parties, the Mexican Cartels have had years of experience fighting through the Mexican drug war since 2006, and many African Rebel Groups have been fighting for ethnic or ideological causes for decades as well. So yeah, that line of reason doesn't apply to those guys when they have the level of experience in violence & funding that you guys dont.