I have more than a year of cumulative backpacking experience all around the world when its just you, guide book ie Lonely planet and a loose plan for maybe next 2-4 days, mostly India but also other places. I don't know if that makes me one with 'higher risk tolerance', definitely higher than 0 to actually experience anything interesting. But I do some more intense sports like climbing or paragliding where some risk is unavoidable and you do your best to minimize your exposure to it, and this mindset then permeates rest of your persona.
As for Bolivia, what parent described sounds like some extreme case of 'I walk randomly into favela with gold chain around the neck and rolex watches and shit happened' kind of foolish beginner behavior. Backpacking gives you some instincts what not to do. Did I feel safe in Bolivia in those few places we've done? Absolutely. Is the whole country completely safe in any situation? Most probably not, or it wasn't in 2018, no idea about current affairs. Btw neither me nor my fiancee/wife speak spanish, you can get by with 20 words if you have to.
I've gone to Iran in cca 2015 (Mont Damavand, a bit of culture), an amazing experience and one of my best. Wouldn't go there currently, not because common people got bad (no, they were amazing and everybody spoke english well) but politics made it unsafe.