It is very, very easy to avoid being poisoned by wild mushrooms. There are many mushrooms that are very difficult to be confused with poisonous varieties, so you concentrate on those. You learn what you need to learn, you go out with people who are experienced, you make use of the resources available (which are significant), and you don't act dumb. Comparing a mushroom you found to a picture in a book and asking yourself whether it sort of looks similar? Is that how mushroom identification works? No, it really isn't. If that's the level you're at, then don't eat that mushroom. But it turns out, if you follow the guidelines, learn from people who are knowledgeable, and play it safe, mushroom hunting can be an incredibly fun and rewarding experience. Most of the difficult to identify wild fungi are random "little brown mushrooms" or such-like that are not particularly good to eat regardless, so not only is the risk lower with sticking to easily identified varieties, the reward is higher as well.
To categorize those who do it as thrill seekers or daredevils is to completely misperceive what's going on, pretty much in its entirety. There might be some folks out there who fit that characterization, but they are not the majority.
Like what? Been toying with the idea of getting into this hobby, but reddit /r/mycology hasn't really revealed much. Where does one start?
Take a class or find a friend who is already knowledgeable. Or you could try getting in touch with culinary foraging folks. You'll quickly find out that there are only a few species of mushrooms that people tend to forage for, and there are fairly easy ways to tell the good ones apart from the potentially dangerous ones. There are also only a handful of truly deadly mushrooms, once you have familiarity with both sets it becomes a lot easier to trust eating something you find out in the woods. Generally, avoid the "stereotypical" looking mushrooms (the "little brown mushrooms" and toadstools), and stick to the most distinctive and easiest to avoid confusing edible fungi.
In that community (northern CA) the majority of people who get sick and die are children of eastern european immigrants: the families migrate here and collect mushrooms that look like the safe ones in their home countries. However, that mushroom often ends up being amanita phalloides. In most cases, it's not adults who die of kidney failure, but children. Adults tend to get sick for a little while and recover.
By far the biggest risk involved with foraging mushrooms is tick-related illness, including, but not limited to, lyme disease. Followed by getting in a car/bike accident on the way to forage, getting lost in the woods, falling injuring yourself, getting shot by hunters or pot farmers, or getting trampled by a cow -- all of which are orders of magnitudes more likely than accidentally poisoning yourself.
And fwiw, there actually are chemicals that you can use to identify some mushrooms, but the government has banned them -- one for being a date rape drug, the other because it's a precursor to meth.
Are you doing some kind of special counting because even cursory googling suggests that this is not the case.
What I meant was there have been no deaths among members of amateur mycological associations. There have obviously been deaths among the general public, but that's not what I'm talking about.