Truth that is in Uncertainty

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Humanity should pursue diversity almost to a fault, preserving wherever possible even those things and thoughts that today appear obsolete, useless, or even harmful.

'Almost' to a fault. 

The pursuit of diversity needs to be tempered with the need to maintain Our viability. 

There is a very real danger of going too far in protecting and preserving the obsolete, the useless, and the harmful, in the name of  tolerance and equal opportunity. The danger is that we will become "politically correct" and seek to preserve that which ought to pass away or be eradicated. 

There are defects, flaws, behaviours, and mindsets that will arguably always be liabilities to the common long term good, and that, if protected and preserved, will undermine our viability as a species.  This applies as much to nefarious ideologies as it does to defective genes.

The meek will not inherit the Earth.  Long term survival will not be for the weak and the faint-hearted.  There will undoubtedly be many occasions in Our future when that very hardest decision of all has to be made: sacrificing the good of the few for the good of the many, and thereby compromising the principle of diversity.  At such times it may well be necessary to be hard-hearted and implacably intolerant of that which is different. 

Holding the line against the human tendency to erode diversity whenever a precedent of intolerance has been set, or recovering to a position of generalised tolerance when the line has been overstepped, is one of the most difficult tasks that any society with its sights set on infinity will face.  Society will always be under pressure from the self-righteous and self-serving to cross what is an indistinct and moving boundary at the best of times, and to move further and further into the realm of intolerance.