Does anyone see the danger in this thinking?
I literally see zero danger in believing this.
None of these "Christians" are going to have any nuclear launch codes or access to any big red "apocalypse" buttons.
If it turns out that these "Christians" were wrong in their way of thinking - and full-out nuclear war does happen and humanity ends - them believing otherwise today wouldn't have changed anything.
The only way there could be a "danger" in them believing this way is if they themselves decided to launch nukes all willy-nilly because they believed that such an action would never end the world.
So - wherein lies the "danger" in them believing the way they do?
As a Christian, I think there is the distinct possibility humanity can wipe itself out before Jesus comes back, at least mostly.
Then - correct me if I am wrong - but you seem to disregard many "Christian" prophecies concerning the end times.
Are you sure you are a "Christian"?
I have a question for you, if you're a Christian. Do you think that all out nuclear war can possibly happen before the rapture and all that?
As a Christian I see zero biblical evidence of any "rapture-like" event at all.
And I believe that the fact that you believe in any kind of "rapture" event may be evidence that you are not going to the Bible for your information on Christ, His teachings and the words of the Apostles - but you are rather relying on the false interpretation of others.
Or do you think God will prevent it?
I do not believe that God would prevent the possibility - I just don't believe it is likely to happen.
Barring the emergence of SkyNet - of course.