Fences Against - Edit2

[dukealien]

Thanks to all the critics.  In response, all I've done is cut the former L6 as balance of the commenters suggested; same with retaining extinction, and "fences" at the end of L2 rather than elsewhere, for emphasis.  Has the benefit of placing "envy" and "greed" near each other, too.

edit1;

Swimming pools
must have fences—
high, unclimbable
and eye-defeating—
not to shield from envy
but from children’s greed
for new territory
and Darwinian
self-extinction.

Too many words:

Inspired by passing through my neighborhood, noting alteration of steel-bar openwork fences and tall, solid wooden ones (the houses with swimming pools).  Sometimes a local code requirement, sometimes legal prudence against the doctrine of "attractive nuisance," that is, a hazard/temptation that can be reasonably foreseen must be abated by the owner.

@just mercedes, didn't think at all of the Mexican/Trump Wall while composing.  Is the US an attractive nuisance to Mexico?  Perhaps in the sense that if the fence isn't there all the neighborhood kids jump in and some may drown or bang their heads on the cement, unsupervised.  But that characterizes illegal immigrants as children, which is inaccurate; they do need instruction - like the classes and tests given aspiring legal immigrants - for everyone's safety and well-being including their own.