Thanks for illuminating this complicated issue! It's so common to blurt slogans and deny subtlety. Anecdote: The first (and last) episode of MythBusters I watc

Thanks for illuminating this complicated issue! It's so common to blurt slogans and deny subtlety. Anecdote: The first (and last) episode of MythBusters I watched pretended to prove you couldn't start a fire by rubbing sticks together. Proceeded to make an ignorant hash of it, tried to create a bow etc but used it upside-down and so on. Conclusion: Myth! You can't start a fire with sticks. Except, my 12-year-old Boy Scouts do it all the time. For fun. When somebody says "That tool is crap", good to consider the source.