The crisis has also been attributed to the questioning of male dominance and rights granted to men solely on the basis of sex following the feminist movement. British sociologist John MacInnes wrote that "masculinity has always been in one crisis or another", suggesting that the crises arise from the "fundamental incompatibility between the core principle of modernity that all human beings are essentially equal (regardless of their sex) and the core tenet of patriarchy that men are naturally superior to women and thus destined to rule over them".