Hi, lovelies. Let's talk about a statistical shorthand that I find very useful in my life for assessing personal risk.
An American's chances of dying in a car accident is about 1/10,000. This is a statistic on a human scale. It's a kind of death I can visualize, and while it's unlikely, it's likely enough that I moderate my driving behaviour to mitigate my risk. So I don't text and drive, and I drive defensively, but I don't consider driving to be a high enough risk to justify not ever driving anywhere. It's a risk I accept as a part of my life
Relatively speaking, I'm much more likely (<100x) to die of heart disease, and much less likely (<.001x) to die in a mass shooting. Heart disease is a big risk, and I change my behaviour every day to avoid it: diet, exercise, lifestyle. A terror shooting is a negligible risk, so I live my life exactly as I otherwise would.
I'm already a very risk-tolerant person, so I can tolerate much, much greater risks than driving, but basically every person in the US has accepted the risk of driving as a part of their life.
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So, let's apply this. You, person reading this, have accepted a risk of death of about 1/10,000 so that you can go to work, or the grocery store, or to hang out with people.
Now, think of something you're afraid of. Is your risk from that thing less than your risk of death while driving your car?
If it's lower, how much lower? Is it worth changing your routines? Is it worth changing laws? It is worth worrying about at all?
And here's one of the most crucial questions: If the risk can be mitigated to reduce your RELATIVE risk (i.e. how risky the thing was with the initial condition versus how risky it is with the new condition), does the ABSOLUTE risk change significantly when the mitigating conditions are implemented?
IF NOT, is it worth trying to mitigate the risk?
We have finite time and resources. If we cal allocate those resources to risks we CAN mitigate and set aside things we can't, we'll be both safer and more effective.
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HANDY EXAMPLES:
- The relative risk of being killed by a refugee is obviously smaller when there's no refugees, but your ABSOLUTE risk barely changes (it's pointless to calculate, because in the US your current absolute known risk is essentially zero, since no one's been killed by a refugee in a long-ass time).
- Getting a yearly mammogram in your thirties with no family history of cancer might lower your relative risk of death by cancer (by a couple percentage points), but barely touches your absolute risk (.03% chance of death versus .04% or so, given my very rough ballparks). So getting a mammogram every year when you're thirty is essentially useless in increasing your chance of survival but does increase risks of false positives/ unnecessary biopsies and treatment, which are actually MORE likely to be dangerous in this age range.
- Current models suggest the ocean levels will be around 2-3 m higher in 2100. If we cut all emissions to 0, this will drop to a 10% chance. Obviously we will NOT be able to do that, so we got a coin flip as to whether or not we'll be able to either knock emissions fast enough or find some other magic pill (with currently unknown or unplanned technology) to keep this from happening. So the absolute risk of most of our costal cities being destroyed by the end of the century (and droughts, and massive displacement, and resource wars, and destruction of cropland, and large parts of the world rendered uninhabitable) is about 100%, but relatively speaking, if we can prevent that by any means necessary we can drop the absolute risk to ANYTHING LESS THAN 100% ARE YOU PEOPLE EVEN PAYING ATTENTION THIS IS FUCKING CALAMITOUS AND YOU ARE DOING NOTHING THIS WILL AND ALREADY DOES AFFECT EVERY LIVING HUMAN ON THE PLANET INCLUDING YOU, PERSON READING THIS, YOU WILL PERSONALLY SUFFER AND MAYBE DIE BECAUSE OF THIS AND SO WILL EVERYONE YOU LOVE
- Walking around for a few minutes every hour and working out a little every week is basically the best thing you can do for your health; it can reduce your relative risk of dying of BASICALLY ANYTHING by about 30%, which, for our big killers like heart disease, can mean up to a 20% ABSOLUTE reduction.
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TL;DR read my whole post, mofo, it's got a really useful risk benchmark and some analysis, go read it and stop being lazy