For one thing, as mentioned in the article, not exposing hospital patients to a completely unnecessary risk of death due to incorrect dosage of medication?

When you're living inside a system, it seems perfectly normal to you, I get that. To me, when someone explains the American measurements system to me, here's what I hear:

> Mr. Zabladowski: If you must know, the currency here is a little strange. First of all, in the small money comes the drakmids. At the regular, normal rate of exchange, there are 59 drakmids to one silver zlobeck.

> Bart Collins: "Zlobeck"?

> Mr. Zabladowski: Three silver zlobecks make one golden kratchmuk. A pastoola normally is, uh, 44,000 kratchmuks. But these, they tell me, are not normal times...

(From the movie "The 5,000 Fingers of Dr. T".)

See the summary here: https://en.wikipedia.org/wiki/Metrication_in_the_United_Stat...

You should be long past asking about why, and should be asking why it didn't happen years ago.