The problem here is among the people themselves. No woman should go alone into such a threat area without being armed, and hopefully with other armed women. Since gun control is pretty widespread, carry knives. The knives are *not* to “protect” themselves, to brandish and drive off attackers, but to aggressively cut attackers.
Only when attackers are injured or even killed does their threat against others end.
So this is the mindset. If you want to use such public areas, you take it upon yourself to severely injure or kill anyone who attacks you. If one, then the other. No other option. Both are your choice.
Unless you want to be raped, possibly injured, and possibly murdered. Choose.
The problem is bringing in large numbers of people who don't share the national culture and values. They are not being assimilated. If you stop bringing such people, the problem will subside. Rape used to a rarity in Scandinavia.
Problem is that in most places they have gun control (Europe in general), they also have bans on knives and about every other possible self defense weapon. The mentality is pretty much that self defense is a criminal act.