Calling part of the government illegitimate is a very slippery slope to justifying trying to overthrow said government. You can say they are corrupt, you can disagree with policies, but saying illegitimate is cause for extreme responses.
I'm sorry but no legitimate court would hide the majority of their income. Those aren't actions of an institution we should place this amount of power into.
Do you always judge the validity of a statement according to the implications of it being true, or do you get to do it just this once as a treat? Further, how does saying a court is "corrupt" not call for "extreme measures" but referring to it as "illegitimate" does? What's the meaningful difference?