Hmmm, I going to risk a ripping apart here...
I think while you shouldn't of course say the sole (or even main) cause is due to what you suggest, you could construct an fairly convincing argument that the destruction of communities, the increased levels of alienation of people from their roots/families/cultural connections, and the insecurity, individualism, and poverty that Thatcherism encouraged did on some level contribute to a society where sexual attacks and assaults were going to inevitably become more commonplace. (Plus - and mainly - patriarchy/capitalism, etc.)