The major point of Camp of the Saints, is that when a Third World mass migration happens, the only way you would be able to stop it is with deadly force, and NO post-WW2 European government will be willing to do that. So there will be no escaping being overrun.
When you have one people unwilling to do whatever is necessary to protect the survival of their nation, versus people who will not hesitate to do whatever they need to do to get their offspring to survive, the latter side wins.
I’m reading Camp of the Saints now. Strange Death of Europe is sobering.