With US bombing Iran, talks of WW3 seems closer and closer. I am, of course, not wishing for this to happen as nothing good will come out of it. But let us think for a second how will bitcoin be useful to us should WW3 actually happen? First of all, expect chaos. Fiat Currencies would most likely decline. Governments would need to print more money to budget for fighting other countries. This will surely lead to inflation. This is where crypto would come in handy. Bitcoin can be a safe haven for most.
The most important thing is if you live in a country directly affected by the war, surely people would migrate and seek shelter. Bitcoins can be helpful for doing this as you will not be carrying your country's local currency. I am sure now that people would be buying crypto in fear of the war happening.
Many won't probably agree with my answer but I got to split it out.
World War is not a joke, you should read about the first WW and the Second WW to have an idea how things will look like of World War 3 happens, and now that every countries have better weapons of mass destruction it is going to be deadlier than before.
Everything will go worse even for Bitcoin, I can't get nuked because I am not living in any of these countries, I am far away in Africa continent but Bitcoin will feel the heat too because the majority of investors are from other part of the world mostly apart from Africa.
Internet will be down almost everywhere and the value of Bitcoin will be greatly affected, to see 10,000 per one BTC will be very possible again, believe me, it will get thay crazy, I don't pray from war but peace and I hope it will never get to this part.
Albert Einstein once said,
"I do not know with what weapons World War III will be fought, but I know World War IV will be fought with sticks and stones."
Indeed, those who study World War I and II, learn about the destructive power of current weapons such as nuclear weapons, chemical weapons, biological weapons, radiation weapons...will see that their destructive power is a hundred times greater than that of the two previous wars. So if that happens it will be the end of every human civilization that has been built over the past hundreds of years, including bitcoin. Bitcoin will not help us at all, so don't expect war and think that Bitcoin will be the savior.