Originally posted 2021-02-10 14:57:20.
When Islam, in the form of the Ottoman Empire, launched the attack on Europe that ended before Vienna, it was engaged in Jihad — fighting in the name of Allah, to make the world Islamic. The Caliph, his general and all the men who fought, were carrying out their religious duty — to conquer the world for Islam. This is Offensive Jihad, the most aggressive form. We see it today in Daesh and similar bandit groups today, but under the Ottomans, it motivated the biggest killing machine in the world.
There are other forms of jihad, and they may, in the right circumstances, be almost as effective at destroying other cultures and their values. They corrode them just by contact.