Well, it’s a silly addition because it is a silly analogy.
Obviously, an unarmed 12-year old cannot harm an MMA fighter at all. Whereas, Hamas clearly has the ability to hurt Israel. So, in your analogy, you have to give the 12-ywar old something that can severely hurt the MMA fighter. So, okay, maybe give the 12-year old a big can of pepper spray. The assault rifle and rocket launcher were more of an allusion to the weapons Hamas actually has.