Well we can say that we are the worst planners or what! echoing @Aki's and other listers sentiments on the power tread it boils down to lack of planning and if they do they don't test it adequately - 2 people testing the system is not the same as when 200,000 + people want to query the db at the same time. They know the numbers and what happens every year. Service delivery at it's lowest. My 2cents 

If the human brain were so simple that we could understand it, we would be so simple that we couldn't. - Emerson M. Pugh