He's old and ill. He's going to spend his final days in far better conditions inside ICTY detention, than he had since he went fugitive. He's going to die inside a prison cell that looks like Waldorf-Astoria compared to shitholes he's been hiding in. He hasn't been a free man for the last 10 years because his movement was restricted. Radovan Karadzic tried to live a second life via his alias of Dragan Dabic, alternative medicine doctor, living freely, visiting and being invited to Croatia on multiple occasions. Mladic didn't even care to have a second life. He's just been hiding, confident about the rightfulness of his past actions.
There's no point in holding a full scale trial. The huge procedure behind it. This man ordered howitzers to target "living flesh, only living flesh!" at siege of Sarajevo. Via radio. Unscrambled. He hasn't been hiding his actions or tried to depict them as something else. Whole world knows what he did, he made sure that we all get the big picture!
Everyone is innocent until proven guilty. But he himself presented all the proof you can imagine. I know it's not possible, but i'd like a special, extraordinary trial in this case, where ICTY would grant 6 months tops for his defense to come up with evidence that he isn't guilty of something ICTY is charging him for. After that fails, he gets dumped in a dark and moist solitary for the rest of his life.