He didn’t want any kind of truths that would have a chance of stopping his railroad to convictions. Sustaining all the prosecutors objections should the defense teams witness speak the truth that would offset the prosecutors witnesses, going so far as tainting the jury against one witness by lashing out in the courtroom & clearing it to admonish the witness. You looking at me, you looking at me, Judge Marchan shades of Deniro’s Travis Bickle character from taxi driver.
Rather ironic you bring up De Niro in a famous role as an example.