In fairness, if your not trained to do something you shouldnt do it. I read through an internal report on a guy being killed today becasue he didn't have the correct training (and therefore permit to work) on a project. He subsequently was blown to pices as he used the wrong equimpent. All he was unsing was an air compressor (like the ones you do your tubeless tyres with, do you have the right training?), just the wrong one for the job.
They were probably told never to do something theyre not trained to do eg: van brakes down, call the AA, don't stick your fingers in the engine because you think you can fix it, you arent trained, you might forget to switch it off, remove battery connections etc and end up missing a hand. But then the daily wail/STW reports this as "incompetent council worker cant spot that the fan belts come off and wastes taxpayers money waiting for the AA all day".
How do they know that bagers dont have some horendous disease, or that decaying doesnt release toxic spores that kill. Neither may be true, but you need to be moderately experienced in dealing with these things in order to know what precautions to take.