You weren't around in the 70's were you?
Hindsight is often 20/20. So easy to judge people today for actions taken decades ago.
Think about the fact that a decade before this was considered normal and a good idea.
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So go ahead and say they should have done modern test standards and run a pilot program 50 years ago. And do what with the other 1,990,000 tires for 10 years while the test was under way? It was a change from changing dumping tires in the ground into something that appeared to be a good idea by the new standards of the 70s. This is the era that still had leaded fuel at every gas station, cigarettes were so common that as kids one of the candies you could get were candy cigarettes. Lead paint wasn't banned until the late 70s.
Making an artificial reef out of used tires was cutting edge thinking of the day.