I'm somewhat baffled this actually happens that often. As a kid, I often went mushroom foraging with my family.

The first thing they taught us kids was to be very wary of death caps, and most mushrooms with gills in general. If it has gills and you are unsure, just leave it. Never had any accidents with wrong mushrooms and had lots of fun, at least until a certain nuclear reactor blew up and we had to stop.