misprosecute

verb

1. To prosecute badly or ineptly.

   “[…] there is a resonable basis to question that Cannada has deliberately and fraudulently misinvestigated or misprosecuted allegations with the aim of shielding a suspected war criminal;”

   “Child-abuse scandals are prosecuted and misprosecuted with almost Salem-witch-trial fervor.”

   “Bucky the Beater, who'd made a career out of misprosecuting gangsters, finally hitting one because the jerk confessed—at least he hadn't fucked that one up.”