It's all just a point from which someone looks at it. Everything, and literally everything that ends up with dead or injury is "stupid mistake". And every such thing could be prevented, if nothing else with laying on sofa at home. But I will say luckily and not unfortunately, we are active people who like to be out in nature, so laying at home is not an option. Now, unfortunately, we all do mistakes. Are they stupid? Yeah I guess, but at the time you make it, it normally doesn't sound that stupid, so that's why you go and do certain thing on first place. I still try to limit stupid mistakes as much as possible, and yes I will still try to learn from every mistake I make, and also from every mistake anyone else makes. So even if someone would mark such accident we are discussing here as "stupid mistake", at least I will still try to get some knowledge out of it to learn something new which might help me one day, not to do same mistake. So even if it's really sad to read such things, I still do mainly to try to protect myself. So I actually appreciate discussion about this.Please please please people -- do not admonish this as a "stupid" mistake that could've been prevented.