It's important to purge all imperfect histories, particularly those which celebrate the totality of achievements in the lives of great men who accomplished great things by vastly greater proportionality in relation to their flaws. 

If we fail to eradicate the memories attached to great men  who did great and laudable things in greater proportion to their failings, leaving to lower judgement by that failure, their common actions which by the standards of the present are considered shameful, we will convey to society that inspired men and women of their time, though they may be judged imperfect to a future era, should be motivated towards great works of great proportional benefit, 

.such a thing can only be detrimental to the creation of the perfect society, one of uniform equality, lack of high ambition,  freedom from offense, and the virtue inherent in shared misery. Praise and recognition should be reserved for those who make others feel great not those who do great things.