It is an intolerant supremacist ideology every bit as brutal as Nazism.
Agreed, and I would wish to add that Islam could easily be viewed as considerably "more" dangerous than Nazism; not only because of the number of adherents it claims but because of it's acceptance and embrace by nation-states. Nazism was quickly realized by everyone except the Left and various political apologists as an evil that must be instantly stamped out. Islam is far more deadly in that it's being embraced in an official capacity virtually everywhere, and so the cancer is allowed to spread unchecked.
There are useful idiots who really believe that there is no harm and that the jihadists are not real muslims.
Then there are the multicultural moral relativists who see what the US and Israel is doing and what Christians have done in the past to be “no different” so they tolerate the Islamic terrorism (while condemning the US/Israel “abuses”). Orwell saw the same double standard ploy from the Stalinists in the West who’d condemn the US and UK but never the USSR.
Then there are the anarchists who want to tear down the current political system and need chaos to accomplish this goal. The enemy of my enemy is my friend.
Then there are the cowards who recognize the dangers of Islamonazism but would rather go through life bowing 5 times a day on a prayer rug than having their throats slit for denouncing Mohammed’s death cult. They also were the sort who couldn’t care less if they were living under “democracy” or Communism.