Kids probably could make the same argument when it comes to video/computer games. They could say "I'm not a stupid baby. I completed a 18+ rated game even though I'm only six." Or something to that extent.
Having principles isn't the same as getting results. He should have fought harder to get results. Had he done that, Lindsay Clancy would have been found guilty and we all could have moved on. But no. The trial ended in a hung jury and has to start all over again.