There are some underlying criminal trends that seem to contribute to violence against women.
Personally I think it comes down to the individual personality a lot of the time, but you guys are right that the men here take their cues from what they observe around them.
They arrested a bunch of men the other day with strong tranquilisers and break-in tools in their car. The only conclusion you can draw is that there are professional thieves out there who also take advantage of women who are drinking in clubs. Slipping them a drug and then taking them home so they can steal or check the place out.
Best thing anywhere you go in the world is to be careful about your personal safety.