Re: OK, mixed feelings about this...
"They see that fate as glorious martyrdom, as glamorous. Yes, we may view that attitude as irrational but that doesn't stop people thinking irrationally."
We don't view it as irrational when it's us. During WW2 young men signed up with enthusiasm to fly aircraft, crew tanks and submarines. My father, who has been a pacifist for years, tried to get into the Fleet Air Arm. All were tantamount to suicide given the odds. My father and his friends brought their loads of men and tanks into beaches defended by machine guns and mines. Most of them didn't survive. They did it because they wanted above all to defeat Nazi Germany.
Unfortunately our politicians and tabloid journalists cannot imagine that the other side thinks just as we do but precisely the other way around.
Ideally I think we need to kill these idiots but without publicity. Leave their fate unknown and uncertain. If you must say anything, leak reports to the tabloids that they died of an outbreak of typhoid or something like that.