As they say in the Middle East, "The cow is down and what is needed are more butchers with sharp knives."
Only in Steyn it's not a cow, it's a camel.
Youssef, being Egyptian, knows Arabic...and likely has a firsthand knowlege of the expression. Steyn's is probably quoting a classic rendition of it. If anything, Steyn may be borrowing from Youssef--though likely they are saying the same things merely because they share the same worldview and opinion.