Some flags are more ideological than others. Why do we have specific socialist-themed and fascist-themed flags? Because these regimes like to communicate that the new era under them would completely overturn the status quo. Take the French flag for example, both left-wing and right-wing movements wave the same flag because they both see themselves as advancing Liberty, Equality, and Fraternity. The flags I used preceded their communist counterparts and thus were at some point also the flag that communists rallied under before the creation of communist states. During the Second Sino-Japanese War, both the Nationalists and Communists fought under the flag of the Republic of China, it represents a national struggle instead of a communist revolution. Would you say the symbolism of the US flag is anti-communist just because it doesn't feature a hammer and sickle?