I feel very sad about all these incidents,.
I had such a fun time going out in the 90's, dressed up, drinking, dancing, it was a very liberating time for me and I hate that things are going backwards if anything, although having to keep safe was on my mind a lot even back then.
I would still encourage my girls to go out though, with the same type of precautions I used to use: look after each other, don't leave anyone on their own, don't take a drink off anyone, don't leave drinks unattended.
The plain fact is that young women are very vulnerable to attack- but not just in clubs, but on dates with supposedly 'nice' young men, house parties, anywhere they are alone with men, even sadly in some of their own homes from family members or friends, sports clubs and so forth, flashed on public transport. I sadly know people abused or attacked or harassed in all of these situations, and less so from nightclubs actually, so there's no miracle 'safe place' for women.
I'm not going to advise my girls to withdraw from the world on this basis, even though being out in it IS more risky.