As long as they know how toxic most of them are. Mercury salts are scary lethal, azides about equivalent to cyanide, lead salts are a bit unfriendly, picrates are toxic too. Then you have nitroglycerin and EGDN oils that can drop blood pressure just from the smell, nitrogen halides like to detonate in sunlight and on contact with organics (like nitrile gloves), peroxides corrode metals and become even more unstable than they are fresh (and dont last long), and the acids used in the manufacture of any of it can burn skin and evolve toxic nitrogen oxide gases.
I've had so many scary lessons! I had a runaway once nitrating ethylene glycol, and once i had a beaker of ice cold peroxide and acetone in the fridge chugging along and opened the fridge 2 hours later to find it boiling.
I hope they understand the importance of using primaries in small quantities only and capping in at the last moment. I hope they stick to stuff like double salts, PETN and ANFO or others more friendly to the so called chemists that follow other peoples recipes over science. And please, tell them that the all too common "encyclopedia of explosives" was written by a chemist who never once did any of those reactions and published some scary stuff! And if you ever see them using a sparkler as a fuse, shut that shit down immediately!