Because we will not submit or die.
All muslims are religiously obligated to seek world domination of Islam by subjugating, converting or killing everyone else on the planet.
If they are faithful followers of their prophet and follow his example, they are a threat to all of us.
According to their book, there can be no peace until there is only Islam.
The reverse of that is there can only be peace when there is no Islam.
That is the real choice we face.
Here’s all you need to know about Islam in one easy lesson:
https://www.youtube.com/watch?v=fgsrnmzxEUY