The philosophical justification for fascism is utilitarianism which essentially boils down to the greatest good for the greatest number of people. It is as Plato said about democracy tyrant of the majority.

Nobody believes that they are bad or evil. People come across as this as their goals are just different from your own. Muslim terrorist believe they are saving the world by doing terrorism. Israeli Zionists believe they are making heaven on earth by their actions in Gaza etc etc.

So its just a matter of what particular flavour of evil u are willing to be for your desired outcomes. U have the choices of blind religious extremism (religious terrorist or Zionist of Christan crusader, hyper rationalism separated from emotion (fasicm or communism depending on ur interpretation). Hyper emotionalism which just makes u a useful idiot to whoever can present the ideology that signals GRE greatest virtue.

So what do u choose?