Knowledge is power and the informed individuals makes better decisions than ignorant people, so those who panic and sale their Bitcoin, when there's a crisis anywhere in the world and it affects price, are just ignorant of how Bitcoin works. Any investor that has the knowledge of bull and bear seasons in Bitcoin, will not worry when it's price begins to dip, instead they'll see it as an opportunity to accumulate more, if they have the money, because price will eventually have a correction and pump will begin. The best mindset for anybody that wants to invest in Bitcoin, is to think long term, not to worry about price volatility and speculations on the short term, because from research bull run will surely come and price will always reach new ATH.
It is just being able to afford to hold, and being aware of the market enough that it was temporary. Even if it turned into a war, that doesn't mean that it will mean something for the market. Have a look at both Ukraine/Russia war and also Palestine/Israel war, you are going to realize that we are going to end up nobody caring about it during the market movements and we have gone from under 20k to over 70k during both of those wars, so if we had Iran vs Israel as well then nobody would have cared about it eventually, and buying when it goes down because of it makes you a lot of money as well.
Thankfully we didn't end up with another war, but the price still went low a bit and people who has seen other wars and what it did to the market, didn't feel bad at all.