>> That wouldn't prevent one off extinction type events like asteroids.

> This is the lamest of all excuses.

> It's a very unlikely for one, we haven't had an extinction asteroid in 65 million years.

He said "like astroids". Quite frankly we don't know how frequent extinction events happen. We've had nuclear weapons for less than 100 years, and have a couple of close calls[1] already.

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1. https://en.wikipedia.org/wiki/1983_Soviet_nuclear_false_alar...