As I type this, there are several hundred thousand of our sons and daughters, brothers and sisters, mother and fathers, lined up in the Persian Gulf, all of them ready to die, if necessary, to preserve and protect the rest of us. They willingly forego self-preservation in the name of some other cause. Are they irrational?
And if not, why is it necessarily irrational for others to die in the service of some cause they believe in? Because they have a different flag on their shoulders?
Radical Islam's goal is the destruction of the West;. Individual, or, indeed, collective survival is optional, irrelevant
or even undesirable. That is irrational.