Conflict Theory Does the defence of a country or a system depend on the least effort, on the best effort, or on the sum of efforts?
The last is optimal; the first is really awful
Software is a mix: it depends on the worst effort of the least careful programmer, the best effort of the security architect, and the sum of efforts of the testers
Moral: hire fewer better programmers, more testers, top architects
Source: 1 Raindrop
And I really couldn't say more than: I agree!