subvert -
destroy completely; "we must not let our civil liberties be subverted by the current crisis"
destroy,
ruin put (an animal) to death; "The customs agents destroyed the dog that was found to be rabid"; "the sick cat had to be put down"
subvert -
corrupt morally or by intemperance or sensuality; "debauch the young people with wine and women"; "Socrates was accused of corrupting young men"; "Do school counselors subvert young children?"; "corrupt the morals"
modify,
alter,
change make less severe or harsh or extreme; "please modify this letter to make it more polite"; "he modified his views on same-gender marriage"