There is a bit more depth to ISIS than what you stated. ISIS's goal is to establish a Muslim state under Sharia law. There are religious and ethnic persecutions going on because of them. We try to help the unfortunate people like the Yazidis. ISIS knows they can't sustain a toe to toe fight with a conventional force - so they use the media to their advantage.
The irony with interviewing Harvard students is that they wouldn't exist in other countries that respect freedom. The Harvard institution wouldn't exist. They think that ISIS is a lesser threat and we are the aggressor? No, the Harvard students are wrong. They exist because of the US government - because of the USA. Harvard would be burned down in an ISIS controlled territory and females like those in the video wouldn't have a voice. Ironic isn't it?