What a nasty way of looking at people and the world.
Think this of as a machine learning problem. The market is trying to get the global optimal point. I'm sure it exists, but the way we do this is pretty much by doing hill climbing, which may end up with a bad local maxima. And there are billions of parameters. You might sometimes want to try a different strategy even if it looks worse temporarily.
As a reminder, if conditions get bad enough, that equilibrium you crave comes at the pointy end of pitchforks.
You will not be able to keep everybody alive. The more people you keep alive, the more people there will be in the next generation who also need to be kept alive.
That "something" doesn't have to be market forces, and it doesn't have to limit growth by killing.
Birth control works just as well (if not better).
That's only true if fertility rates stay above the replacement fertility rates. As nations become more developed, fertility rates tend to fall. In the EU-28 the fertility rate was 1.58 children per woman in 2015, well below the replacement rate of 2 [1]. India's fell from 5.9 in 1960 to 2.4 in 2015 [2].
> There's going to have to be competition for resources, and those who lose out will die. We may as well get used to that now.
Your Malthusian view is outdated. We can easily feed and shelter the current population (and projected peak population) for the foreseeable future.
[1] http://ec.europa.eu/eurostat/tgm/table.do?tab=table&init=1&l...
You could accomplish much more by cutting the fossil fuel subsidies ($5.3 trillion in 2015 if you count the externalities [2]).
[1] https://en.wikipedia.org/wiki/List_of_countries_by_carbon_di...
[2] http://www.sciencedirect.com/science/article/pii/S0305750X16...