^ The data I'm
looking at sez that most drownings of adolescents and adults occur either due to accidental entry into the water or whilst swimming/paddling/wading, the latter in particular occurring mostly in non-pool environments, i.e. those where conditions are not entirely predictable, suggesting that the problem is folks suddenly finding themselves quite literally out of their depth. Seems to me that knowing how to swim (and I include basic safety/survival knowledge - i.e. water entry techniques and the ability to recognise rips - as part of that, in the same way that knowing how to drive is not strictly limited to the mechanics of operating the vehicle, if it was then 10yr olds would be on the road) would significantly reduce the likelihood of such deaths.
I admittedly don't know about Oz, but in the UK, drownings are about 300 per year inland, 300 per year coastal. I believe the USA has a similar incidence rate (obviously their absolute numbers would be higher given the greater population).
So to start with, that's a really, really low number. That in itself makes it questionable whether swimming can be classified as an important life-saving skill.
But we can go further. Out of those 600 deaths, a significant percentage (I believe around a quarter to a third) are in the under 5s. They cannot be expected to swim well, so their ability or lack thereof is almost irrelevant. Of the remaining 350-400, a large chunk (again about a quarter or so of the remainder) are intoxicated. Remove those (if you're drunk, even if you're a good swimmer, you won't be swimming well). That knocks us down to about 250-300. A large percentage of the rest are adolescents who are simply being stupid: playing on thin ice, cocking around near canals, showing off to their friends, etc, etc. If they weren't being stupid, they wouldn't have died. So the key variable isn't their swimming ability, but their lack of ability to monitor their risky behaviour. OK, that probably leaves us with about 50-100 where otherwise responsible adults died through drowning. Some of those are the elderly or otherwise disabled, where their swimming ability has been degraded. What does that leave us with... a generous 50 a year, maybe, where being able to swim better would have been the bottleneck variable that would have saved their lives? Pretty damn small number. And even there, a lot of the deaths might have been prevented with prompt CPR at the scene by a passer-by.
I'm not saying being able to swim wouldn't, in some long-shot situation, save your life.
I AM saying that to consider it a key life-saving skill, which everyone should acquire, something to be prioritsed, and whose absence is a serious issue requiring social study and even possible remedy by the state, is quite a stretch.
If you wanted to reduce the number of deaths from drowning, teaching people to swim would be WAY low down the list. The top things would be:
1) Educate on proper parental supervision of their children near water (be it a beach, or a pool, or especially the family bathtub).
2) Educate adolescents not to mess around near water
3) Ensure adequate railings/protection near water
4) Educate adults not to drink heavily near water
5) Educate adults how to perform CPR, and the importance of continuing CPR on drowning victims (esp. cold water drownings) far longer than they might otherwise do in other situations.
Teaching people to swim better would probably come next, after those. Prioritising it, given how badly we do the others, isn't going to yield a particularly good ROI.