David Hogg was ratcheting up an anti-gun crowd of protesters. The problem is: he was in Canada, and his rhetoric was pointed toward changing America. According to the report, Michael Moore had a moment of lucidity and took his microphone away.
David Hogg is a young, ignorant, aggressive Fascist, that doesn't realize the sedition he practices can lead to time in jail. While some might think charging him with a crime will only lead to more publicity, the publicity is much less of a problem than his actions. Sedition is a serious crime, and Hogg is a serious criminal, who's actions border on treason.