I don't worry about N.Korea or other WW3 scenarios because if things really get that bad then our BTC holdings will be the least of our worries.
I would be more worried about Govts. (especially bankrupt Western govts.) running scare-stories about BTC. Linking BTC to drugs etc. hasn't done too much damage so far but I think linking it to terrorism could have more of an impact.
Most people are very poorly-informed and wouldn't have the capacity to realise that ISIS are already using all types of fiat without people boycotting those currencies.
But the petro-dollar scam will fall apart one day in the near future and at that point I would hope that will push more people into BTC to save what little purchasing power they still have.
Yes, mainstream media has a nack for scare tactics and making most people believe something is bad or "evil". One of the ways we are controlled by government is through monetary policies. Bitcoin would eliminate that and the media could easily make it seem like something to be feared.However, you can't just shut down the internet.
The tides are changing rapidly as more people are becoming hip to the scene and I think we'll see some government action in the not so distant future.