I disagree 100% you do not need to be trained with a bayonet to fight for your life. You will not be fighting in trenches or in any type of warfare maybe in a conflict against other trained enemies you will need training. But the bayonet will be used for home defense and defending your life. not fighting wars or stealth kills like you see in the movies or video games. Its not to "look cool" If your weapon fails you during a home invasion or there are more than one home invader and you are out of ammo then you have an immediate weapon at the end of your shotgun. An 18 " barrel with a folding buttstock makes a nice compact short little spear for home defense. no matter what it will always be there. if a real situation occurs and your shotgun does fails you what are you going to do? Are you going to tell the intruders "hold on guys let me go get my 45. In the other room!" NO I doubt that will happen they will not give you an opportunity to get to your sidearm they will beat you and execute you or maybe rape if they were that crazy. With a bayonet on the end of a shotgun atleast you still have a fighting chance it does not take much to puncture somones abdomen or throat and if I were outnumbered and out of ammo id be wishing I had a bayonet you dont need to be trained in the military or be specialy trained in bayonet hand to hand combat and all that mumbo jumbo unless your going to combat or war. the humans will to survive is very powerful. cavemen have even used spears to defend there lives. Having a bayonet its so simple even a caveman can do it
and its a cold hard fact that with a bayonet it will be the most quickest back up weapon there is. your adreneline will be pumping and you wont have time to fumble arround for another weapon in the middle of the night. having a bayonet on a shotgun is having two weapons on one system id rather have that than anything else so it is practical not to just look cool.