@MarqFJA87
The buck has to stop somewhere. Absolute authority has to be placed in SOMEONE, otherwise it's a neverending circle of checks and balances. The way you mention it would make the Truth Palace borderline useless because it's meant to be an agency that's SUPPOSED to have such absolute authority over cases like this.
And what's stopping people from falsifying evidence, like what the pig noble's undoubtedly already done? He sent a fake messenger to lure the men out of the fort and having them lose the fortress. Ignoring any noble in-fighting wouldn't it be suspicious to anyone that an entire military force was able to be lured out at the word of a lone messenger? What if it was a rival nation that did it instead of one of the nobles? There's way too many outstanding problems with just ignoring a case like this.
Not to mention, the pig noble and his soldiers just so happened to be nearby when the fortress was attacked. In an area that is clearly out of his jurisdiction. If that's not suspicious, I've got several bridges to sell the people in this nation.
Then again, this is an isekai with anime titties and sex, so I'm probably just reading too much into this.
@Faryshta
As I said to Marq, the buck has to stop somewhere. If they are afraid of evidence being falsified, they have to investigate it themselves, just like detectives do in real life. Someone has to have the authority to make the call on this, and if the Truth Palace doesn't then they're pretty much useless and a pawn of the nobles to conveniently target people they don't like.