Idea: Love Potions were used, but not by the usual suspects. Harry, Ron, and Hermione each have their own reasons and there are stories behind those reasons.
The judge sat there rubbing his temples and ineffectively willing his headache to go away. He'd sat dozens of love potion cases, but had never been involved in one quite like this. One innocent woman's reputation had been ruined already...
"So let me get this straight. You, Harry Potter have been feeding yourself mild love potions since the age of fourteen after you hit puberty and discovered that you weren't interested in relationships with people of either sex. Hermione Granger has been feeding herself love potions keyed to Ronald Weasley because she acknowledged the fact that unless the magical world, or at least the portion she lived in, were completely destroyed and rebuilt, the only way she would be able to reach her ambitions would be to marry a pureblood, and realized that she was likely not to get any better offers than Mr. Weasley. Mr. Ronald Weasley himself has been feeding himself love potions because he discovered he was gay, and rather than come out of the closet, he decided to pursue a more "acceptable" relationship."
"That is correct your honor." three voices chorused at once.
"The charges against Molly Prewett Weasley, and Ginerva Molly Weasley are hereby dropped. Case dismissed."
And people wondered why he spent his evenings at the bar...