Sounds like a typical right wing authoritarian, fascist argument that you have to purge the deviants, radicals and the weak or else the state itself will cease to exist because internal and external threats will overwhelm you due to those weaknesses.
However pluralistic societies have proven they can survive just fine. According to Freedom house of the 192 countries on earth about 92 are liberal democracies, meaning they have democratic infrastructure and generally follow the universal declaration of human rights. So tolerating those who are different or weak (rather than purging them) is not anathema to a functioning state. In fact, according to the book “the J curve”, open pluralistic societies are more stable than closed authoritarian regimes.
If anything, people like the author are putting the state at risk.
By turning a nation into a fascist dictatorship, you destroy people’s morale to fight for their nation. If the US were a fascist dictatorship being invaded by a liberal democracy (say Canada), I would support Canada. If we were invaded by Japan and Germany in WW2, I would fight for the US.
By turning a nation fascist, you destroy innovation and infrastructure which makes your nation weak. Hitler (as an example) purged the ‘weak’ (aka the jews) by kicking them out. They went to the US and helped us do the manhattan project. Stalin purged the weak (his generals), and then when Hitler invaded he couldn’t defend his nation. Pol Pot purged the ‘weak’ (businessmen) and as a result 1/3 of hte nation died of starvation and disease, and the Vietnamese easily conquered Cambodia in the late 70s. Mao purged ‘the weak’ in the great leap forward and the culture wars. Those were disasters.
On another note, according to the democratic peace theory, functioning liberal democracies do not declare war on each other. So a world with as many liberal democracies as possible will not be constantly at war. As a result, you do not need fascist authoritarianism because external threats are lessened due to a world of democracies.
There are ways to support the state other than war. You can pay taxes, work a job, be an informed citizen, give to the community, grow the economy via innovation, etc.
Another issue is that in a democracy the public have a say in war. The first Iraq war was about oil, trying to make sure Saddam didn’t have control of Iraqi, Kuwaiti and Saudi oil by himself, which would’ve given him economic leverage. Some people would choose not to fight in that war. The concept that all pacifists are the same is bunk. I would’ve supported peace keepers in Rwanda during the genocide, but I would not support invading Saudi Arabia just to get the oil. So I am a war monger in one situation and a pacifist in the other.