I suspect that England has it worse than most other places because of the spread of English through the Internet. Way more potential migrants around the world know English.
Rape-gang members have to know the local language in order to be able to coordinate with or coerce other local parties, avoid law enforcement effectively, convincingly disguise what they're doing, and lure in and manipulate their victims. You can't do all of that if you're speaking broken English or using google translate for every conversation.
The average rapey migrant who doesn't speak your local language can bumble around the country for a while, drag a woman off into the bushes to assault her, and maybe even avoid detection and get away with it through sheer luck—cameras weren't in the right spot, his DNA isn't in any database, etc.—but he can't keep an industrial-scale rape gang operation going like what they have in England.
Most people don't try to learn Dutch as a second language, or pick it up from their media. Good. Stay niche. Be inaccessible. Don't help people learn your language.