To impair the quality of, spoil; to debase, corrupt. In law, to make defective, as in to vitiate a claim.
We do not draw the moral lessons we might from history. On the contrary, without care it may be used to vitiate our minds and to destroy our happiness. In history a great volume is unrolled for our instruction, drawing the materials of future wisdom from the past errors and infirmities of mankind. It may, in the perversion, serve for a magazine, furnishing offensive and defensive weapons for parties in church and state, and supplying the means of keeping alive, or reviving, dissensions and animosities, and adding fuel to civil fury. History consists, for the greater part, of the miseries brought upon the world by pride, ambition, avarice, revenge, lust, sedition, hypocrisy, ungoverned zeal, and all the train of disorderly appetites, which shake the public with the same.
—Edmund Burke Reflections on the French Revolution (1790)