That's what scary about these stokes mortar type mortars. Guys just clamp on T&E and a base plate and go shooting. They really don't know what they are doing. One group in Indiana was even using smokeless powder.
As much as I don't like seeing these things on this board, perhaps it better if we do have them and educate folks. If we can get folks to build them correctly and it keep one person from getting hurt then it can't be bad.