'This old Earth has seen a full share of travesty. Almost every species lives at the expense of other life forms. To live, we compete.'

Calling the very essence of our planet's natural existence a 'travesty' is a dubious premise to build any logical argument upon.  As luck would have it, the author doesn't make an attempt at logical argument, but instead seems to have cobbled together some thoughts around a theme (global population) with political manifesto:

'Population density increases strife that leads to hasty measures like bombing the hell out of them…”them” being those of different origins, lifestyle or creed.'

The part that really made my head shake is in the last paragraph:

'The challenge for quality-of-life-minded generations will be to find more thoughtful, peaceful and voluntary means.'

Voluntary means of thinning the herd?  Really?  Wasn't there an episode of Star Trek about that?