Nationalists are not motivated by reason. Just telling them they're going to start a nuclear war isn't a deterrent. Loyalty, sacrifice, obedience, ethnicity, borders, tradition, etc are their primary motivators today. If they have to end the world with nukes to protect "their" nation, then by golly, that's what they'll do. Self-preservation isn't as important as preservation of the
ethos.
Look at any white nationalist terrorist organization. These are people who risk their lives to blow up buildings (sometimes their own government's), commit assassinations. They are aware they are putting their own lives at risk, but they do so anyway because in their minds they are doing the only thing that makes sense. In a competition with belligerent nations, nationalist zealots are happy to die for the cause.
The only thing that can stop them is if the non-zealots, who are never as motivated, come out of the woodwork to stop them. As we've seen time and time again, most regular people just aren't willing to risk their own safety or standing in community to speak out against or fight against those who are doing wrong in their community. This is why nationalists win. They are way more inclined to get in people's faces than calmer, more rational folks. Easier and safer to go along with the crowd. And so goes a nation.
Look at any white nationalist terrorist organization. These are people who risk their lives to blow up buildings (sometimes their own government's), commit assassinations. They are aware they are putting their own lives at risk, but they do so anyway because in their minds they are doing the only thing that makes sense. In a competition with belligerent nations, nationalist zealots are happy to die for the cause.
The only thing that can stop them is if the non-zealots, who are never as motivated, come out of the woodwork to stop them. As we've seen time and time again, most regular people just aren't willing to risk their own safety or standing in community to speak out against or fight against those who are doing wrong in their community. This is why nationalists win. They are way more inclined to get in people's faces than calmer, more rational folks. Easier and safer to go along with the crowd. And so goes a nation.