Thus is what I hate when a story like this comes out: it brings forth the xenophobes who hate multiculturalism. The language used is just atrocious. You can tell from the pronouns used, "THEY raped OUR women." Or "ugh, these vile ASIAN men" "religion of peace my ass" "they're barbarians". Said people get SO angry because of the 'us vs. them' mentality they have, rather than because of the incident itself.
If 15 white guys raped a white girl, noone would say culture is the problem. Noone would say 'Christianity' is the problem. Finally, if those guys were from some other European country (Poland for example) noone would say "go back to your own country."
Their ethnicity or religion is not the problem. WHAT THEY DID, is the problem, and it's something ANY group of people can do, regardless of race, religion or anything else.