In this same reality it's also still more expensive, logistically difficult and just again inhumane. If the afd is getting close to taking charge entirely, I'll take my bike to France to learn how to make the polices job a living hell. Just resigning to stupid outdated thinking doesn't seem particularly appealing to me.
Sure some might cheer when they start to push that hard against immigration. Others will riot and burn the streets even worse than they do already. Because for example we believe having such a thing as universal human rights is a good idea.
Because completely counter to whatever you think about defending borders countries have for literal time immemorial tried and failed to gain advantage or prevent each other from doing so by military force. It's been catastrophic every single time. Or are the Greeks Romans, Chinese kingdoms, Nazis, Soviets, still here with us today, did they have a graceful and good end to their reign.
The choice you present is false both options will inevitably end in the decline of the West, one just might be faster than the other. But there is in theory at least better alternatives, they just require Europeans to stop being US lapdogs. And letting go of the thousands of years old doctrine of military and economic domination, that creates most of its own problems to begin with.