The reason to not threaten these guys’ children is because it is dumb, and it is dumb because it would not work, and anyone weho knows jack shit about the jihadi mindset would KNOW that it would not work. They would consider their children to be dying martyrs’ deaths, and to thus be assured Paradise, and themselves to be willing to sacrifice their children for Allah, so they would eventually be allowed by Him to join them there.

A jihadi win-win all the way around.