Why are shotguns banned in war?

To those who cannot believe that shotguns are an effective and widely used weapon system on the modern close quarters battle field. I hold no ill towards you, this as any forum should be an educational experience. Just don't be obtuse when someone tries to educate you. Will the shotguns ever replace the rifle on the battle field? No, absolutely not. No one is saying it will, regardless of how effective they are in close quarters. A carbine with a barrel length of less than 20 inches will never replace the rifle either. Carbines and shotguns are too mission specific to replace the full length rifles. That said they all have their place

Germans did try to get them banned during WWI because a relatively few guys (say 100) armed with shotguns loaded with buckshot could clear a Battalion of men out of a trench due to the spread. A shotgun with the right or wrong load depending on how you look at it can take limbs off at point blank range and as the shot spreads out it can take out multiple targets. The Germans were unsuccessful in their attempt to get shotguns banned and shotguns are now used by almost all if not every military in the world for room clearing, and breaching operations.