I’m not interesting in motives. The methods are what ISIS advocates. That means they’re inspired by ISIS lunacy.
They’re “fighters” for the caliphate because they murdered Westerners and non-Muslims, who were almost certainly among the dead. An international airport terminal is a favorite killing ground for these savages.
The Islamists live for the sole purpose of destroying us and establishing control over the world. They’re deadly weeds in the garden of life and civilization, and need to be rooted up and destroyed with all prejudice.