I am not certain I agree.
In some respects, there are some basic elements of, for instance, national socialism, that are still present in all European countries - namely the socialism.
This ingredient removed from the nationalism is harmless to everyone except the people living in the society itself. Sort of like baking soda without vinegar.
It is distincly possible that if we fundamentally alter the Arabic culture - based on an economics of scarcity - we will be able to remove the violent element from Islam.
I certainly have seen and recognize the counter arguments of why Islam is a religion of hate and war. To a certain extent I agree. But, German culture was a culture of xenophobia and war, but it no longer is. Which proves that cultures can change.
Long before Islam the Arabs were cutting off hands, oppressing women and fighting barbaric wars in the name of their local god. It is this basic culture that must be weeded out.
Otherwise we might as well just kill the whole lot.
I agree, but frankly I don't think secularism is up to the task of making such a radical change. Minds and hearts must be changed almost instantaneously or the deeply ingrained thinking and culture will ultimately prevail. IMHO, the only agency up to that task is religious conversion (specifically, Christianity). Otherwise, the malignancy is simply papered over to fight another day.
Otherwise we might as well just kill the whole lot.
That will be unnecessary with conversion. Otherwise, the best we can hope for is a temporary remission of their all-consuming jihad, which may be successful the next time around.