If he could protect his father from those accusations, he would. But they both deserve them and perhaps it is better that Maedhros can't stop them nor block them out. The judgement of the Valar doesn't hurt nearly as much as the judgement of those who were slaughtered all for the sake of some jewels.

"I lost my anger long ago." because there was no use in carrying it when everything else had been stripped away, "I am one of the last that recalls how we used to be." and those are memories worth cherishing and keeping.

He makes a plate for himself, eating the food without enjoyment or relish. It is merely a means to survive.