I feel fairly confident I don't need to use 'no true scotsman' to argue the fact that no one with a "D" after their name asking Zuckerberg a question today has ever said "Kill all white people."
On the other hand, Cruz wasted our time, and more importantly, the time any other member of Congress would have had to ask something important, asking Zuckerberg about a Chick-fil-A Appreciation Day page that was deleted for 12 hours, yet failed to mention the words "Cambridge Analytica." Hmmmm.