Meh. The release forms were pretty clear. And if you aren't capable of judging the technical merit - well, that is a decision too. You're deciding to take a leap of unknown risk.
We need to stop being this judgy. People should be allowed to make decisions - including the decision to trust someone else - that turn out badly. They paid for those decisions both figuratively and literally. They weren't exactly tricked.
I think the good lesson here is that if you aren't capable of judging the risk of something, you shouldn't participate in it. Some people will violate that rule and some of those people will die. It's ok. People die for stupider reasons and nobody lives forever. It doesn't make the world a better place by trying to eliminate every possible source of death.