 Trump doesn't need to tell voters that Joe Biden is old and that Hunter Biden is a drug addict. He doesn't need to insult or interrupt him. He needs to keep himself under control because the most important message he can send to the public is about himself. Trump's persona is the biggest reason that he grabbed Republican politics by the throat and hasn't let go since 2015. It's also the reason that he's been in precarious situations as an electoral bet, narrowly winning in 2016.