The groundings happened after the 2 crashes. When the groundings happened it had the 3rd worst record of then flying large commercial jet aircraft and far from the most dangerous of commercial aircraft of all time.
Tossing that many caveats and still not being the worst aircraft is shocking to many people.
e.g., "Things ran great, until ... they didn't."
This gets my vote for most vacuous statement on HN this year.