From what I have read? There are a few terrorist groups throughout Southeast Asia and a plentiful supply of young ones that have been brainwashed into thinking they will be martyrs for doing this.
It's nothing new there or the Philippines and a few other areas like Japan.
They are all anti-government groups and mostly Muslim. But terrorism is world wide and will continue to be so.
Cowardice? Not necessarily but stupidity and waste of life do come to mind.