Try for a moment to put yourself into the mind of somebody who is live-streaming a crime they are committing. They cant see it as a crime. They have no fear of punishment. They are expecting "likes" or good reviews and positive feedback. The fact that this happened is an indictment of the country hosting them. In the words of one Muslim rapist in Sweden, "I did it because we won. You are our slaves."
I was thinking of something along those lines. This is similar to videoing a beheading and posting it on the Internet. They want to brag about it. They want to incite fear both in Swedish women and in Swedish men. They want Swedish women to wear burkas out of fear of being raped, and they want Swedish men to insist their women wear burkas out of fear of their women being raped.
It is not just rape, not just crime, it is terrorism. It is information warfare.
They are saying "We did this to your women in your country, and we want you to know we did this to your women in your country."
This is conquest