That's Sikh!
I mean, this is a serious issue but glad to see someone finally stand up to these savages. From what I remember, the Sikhs have a long standing tradition of fighting against Muslims. They been through these before so they definitely won't let these just pass without an action from them.
The reason groups can't band together against Muslims is the fear of being called a racist (as if Islam is a race, duh). Note that the Sikhs are not going after all Muslims but simply "protecting girls". That's how other groups can start. Start with protecting boys and girls from rape, then proceed to stopping them harassing people for not wearing veils, etc. With groups started, these groups can then start doing "joint watches" and so on.
Here is one new trick for me how the muslims were able to gain hold against sikhs girls. They kidnapped them, rapped them on videos and then threathened them to release video to force them to continue.
Are you saying that they use the videos to blackmail these girls to have even more sex with them? How does this even work? Are the girls too afraid of the shame if these videos are ever released?
In my country, there is a similar thing called "revenge porn". Basically take vid of yourself with your gf and use that to harass her when she try to break up (or release it if she suddenly dump you). With double standards on women, it's easy to see how powerful a tool of exploitation this is. Especially these girls. I'm assuming Sikhs are also somewhat conservative and this could ruin their chances of marriage later on, even if what happened is none of their fault.
My opinion is that they shouldn't be afraid. I'm assuming of course that UK have a stricter anti-cybercrime law than what we have.