I was breadboarding with TTL from an early age, back in the days when solder had a lot more lead, a TV chassis was live, and mercury tilt switches were clear glass bulbs freely sold with no awkward questions.
Steel wool and jumper cables were the limit of our destructive nature. Although not many speaker cones survived for long either. Once or twice we did very dangerous things with multi-tapped transformers and CRT yokes from those same TV's.
We did this in sheds where asbestos was routinely cut and nibbled. One of my lay friends went home one day and told his parents I made bombs in the garage. This took a while to die down even in those days.
As for short circuiting, the "crowbar" approach always held an allure. After all it does protect everything downstream and the fuse is serving a purpose.
Nowadays every home should have RCD/earth leakage protection and our work areas a big fat red mushroom switch.
Boards and shields with screw terminals and pins are way safer.
My wife has a Master's and does not what to do with a soldering iron.
Should you get your Raspberry Pi on and teach them to code instead ? If anything this is more dangerous and they probably won't learn any more Python once they realise that C projects run 10 times faster.
It bothers me dreadfully that these processors are often used as sledgehammers to drive in thumbtacks. Many applications could be served by dedicated devices such as 555 timers or counter-scalers. Maybe we just like to dabble.
Anticipate fire, anticipate burns. A bucket of sand for fire. (I still wonder how we could make DC powerpacks for 5V and 12V and use the same connectors) - can't have halon any more either.
Of course, then there is the risk from the project. Let's say a controller for a live steam engine. What are the risks from a sketch gone bad ?