He did not say it's the only system where it happens

It seems he was just saying that in the current socio-economic model for most of the planet the elite of that system (the "capitalists") push for that behaviour, not that it wouldn't happen under any other

If I say I get wet when it's raining outside, I'm not implying I can't get wet during a sunny day (I might just have bad luck and someone dumps water out of a window)