Well now you are making a positive suggestion.
Seriously, while we can't do that, we have pissed away opportunities to hurt the spread of Islam in a serious way. Instead the west has encouraged its spread. Laying the groundwork for the future deaths of many innocent westerners.
We can't "kill each and every one of them" but the reality is that in order to survive as a culture, we will at some point be forced to kill a lot of them.
Not being on constant offense against Islam is tantamount to surrendering.
“we will at some point be forced to kill a lot of them.”
At least until they tire of dying.
It’s how we handled Japan and Germany.