The most pervasive example is the supposed split between Communists and Fascists, who literally want the exact same thing. Their ideologies are almost indistinguishable from each other and are only differentiated by the values they purportedly enshrine. Each willingly ignores their ideologies' shared ancestry, instead choosing to bicker over which symbols are on their flags or which demographics they subject to oppression and/or genocide. When challenged on these elements of their ideologies they present excuses about their prior implementations, without realising that the "failings" they are identifying are inevitable products of human nature when their ridiculous and extreme ideas are actually implemented.