Earlier quoted context omitted.
It is also a problem with accurate images and descriptions. Some mushrooms are very easily mistaken for others: unless you're 100% sure you've picked this very species before in around the same place and time, you'd better leave it there or bring it to a mycologist for identification.
I agree, I always thought eating mushrooms required an expert for confirmation, otherwise you are rolling the dice. Buying a random book off Amazon and using that seems like the very definition of something a non-expert would do.
In my childhood, when we lived in real suburbia, with woods in 5 minutes of walk or right at the door, we routinely gathered mushrooms, and never had a problem.
We stopped it when we moved to other places, or probably because adolescence came around -- probably, parents had taken us for an interesting kind of walk, and then we'd not want it anymore.
Right now I can only recall some names of mushrooms and only sure of one species, so I won't risk at all.