I have a license for pressure cookers . . . I went to classes and got my CCPC, but I still can't carry 4-Quart (military grade) cookers.
Now, if only politicians would pass meaningful laws, this whole nightmare of murder would not have happened. Frinstance, they could have banned CCPC such that the bros would not have had these bombs out of view in backpacks, and instead ALLOW OCPC, thus alerting the nearby public to give them a wide berth, and thus saving their lives.