They are primarily for panty waist libtards who don't want to actually hurt a dangerous two or four legged critter that will kill you. Libtard politicians mandate it for crowd control instead of actually killing a murderous crowd. When you use military forces to do a Law Enforcement function, you have to go counter to a normal military mission and NOT kill.
Rubber bullets and buckshot are LESS lethal, not LESS THAN lethal. They are still potentially lethal.