Yes, people and institutions, and technologies.
What gives security is something like "hybrid vigour" obtained by the whole system because it has evolutionary resilience (it's survivable, at least in part, to the greatest range of possible threats)
Parts of a resilient system can even be in moderate tension as they keep a check on each other.
For examples; it would be stronger to have both centralised and distributed philosophies represented; it would be good to have a mixture of public and private funding models in operation; small and large entities capable of agile innovation, and reliable scale.
That makes it hard for a malevolent or erroneous force to infiltrate and take out the whole barrel of apples.
Of course, diversity of gender, religion, race, age, political leaning and wealth tend to make a more interesting and vibrant workplace, but that's not primarily what I am saying.
