I would guess they were probably used in response to some nasty shit the rebels did like torturing/mutilating some important guy or his family or something. Some nasty muslim shit probably happened so they used weapons of terror for revenge. You're right though I can't think of any good/useful reason
Imagine you are Hatfield and every time you go outside McCoy is shooting at you from his daughter's bedroom window eventually you're gonna put a bazooka through it
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