Pretty close t what I have in mind. Threats may be exogenous (extinction-level asteroid strike, gamma-ray burst, ...), or endogenous (anthropogenic climate change, nuclear winter, ...). With time and scale, the latter seems to become more likely.

Many of these endogenous effects are essentially unforseen consequences, though there might be other descriptions which fit (denial / willful blindness among them). Almost all operate as hygiene dynamics, that is, the failure to sustain or support vigorous, healthful function, not merely of individuals, but at a social or societal level.

The etymology, and specific recognition by the Greeks of hygieine techne, "the healthful art", being notable:

https://www.etymonline.com/word/hygiene#etymonline_v_16114

Eventually, all creatures foul their own nests. Even with mitigations, this is inevitable. Some waste product or effect will prove limiting.

The effects also virtually always prove to be unintended consequences. See Robert K. Morton.

Excess cleanliness or vigilance seems to have several negative dynamics. Quashing internal ambition or creativity, as happenned historically with China, is one. Removing selective pressure, possibly another. Giving rise to pathologically reactive social security apparratus, as with police violence, ICE overreach, and excess NSA/CIA/FBI (or NON-US equivalents), akin to autoimmine disorders, another.

Competitive pressures are probably another dynamic, worth consideration. Thanks for mentioning them.