I would not eat mushrooms I did not collect myself.
To kill someone is very rare as we have only a couple deadly mushrooms in north amerika. Amanatia is the bad one. It is very easy to spot once you have seen one.
Some are just mildly toxic and most people can eat them without any problems other than some diarrhea.
Best plan is to learn the ones in your yard first.
There is a process to test a new mushroom.
Sounds like the victims were very old and may have had other health issues.
For anyone worried about a bugout a good mushroom field guide will be very useful as they are prolific and filling.
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