sachs. they say it was clearly a house of cards waiting to collapse. jon stewart launched his tv comeback on apple tv. he warned the new program won't be as funny as the daily show, he's getting lousy reviews. he started with a deadly serious topic, iraq war veterans who haven't been able to get healthcare after being exposed to toxic chemicals. >> burn pits. burn pits. we did that to ourselves. and as these smoldering ashtrays of freedom burned, they released a bouquet of carcinogens and it has had devastating consequences for the people who served. howie: he chatted with ailing veterans, interviewed the va secretary. knows 45 minutes of this sober stuff doesn't have mass appeal, and he's right. crew saiding rather than -- crusading rather than comedy is