I can't think of many places in N. America where safety glass is the norm in buildings. How many commercial buildings use safety glass? I don't know. But certainly there's little or no safety glass in residential areas aside from cars. Modern glass is arguably tougher, but if the meteor had hit over a populated N. American city there would have been a fair amount of damage and injuries also.

The "shards of glass" problem puts me in mind of the Halifax explosion in 1917. Outside the half-mile radius of total destruction, buildings in a 16 mile radius were destroyed or badly damaged. And then the fires took hold. An enormous amount of injuries were from shattered glass. True to human nature, people went to the window to look at the munition ships on fire in the harbour. It was, arguably, the largest man-made explosion of the pre-nuclear era.