Harry is inclined to agree. Honestly, Remus probably isn’t even outright lying. Harry knows he’d love to bring a case against Dumbledore if he could; Sirius would probably have Dumbledore drawn and quartered for his failures regarding the entire Potter family. The rest of the Order, they all lost people in Dumbledore’s war and most of them are probably disgruntled enough about everything to take it to court, just to give Dumbledore even a fraction of the suffering they’ve gone through themselves.