欲加之罪,何患無辭 [ㄩˋ ㄐㄧㄚ ㄓ ㄗㄨㄟˋ , ㄏㄜˊ ㄏㄨㄢˋ ㄨˊ ㄘˊ; yu4 jia1 zhi1 zui4 , he2 huan4 wu2 ci2]
If you want to condemn sb, don't worry about the pretext (idiom, from Zuozhuan 左傳); one can always trump up a charge against sb
Give a dog a bad name, then hang him.
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