It would be great to live in an ideal world, where we could all do as we wished, without being at any risk of harm, but that world does not exist.
When people have had a drink, they lose their inhibitions, they can misjudge situations, and they can wake up really regretting their actions from the night before. I am sure most of us have done that at some point, and most of us will have been lucky enough that we have woken up safe and unharmed.
I have seen many of my mates get pissed, and have one night stands, that had they been sober they would have thought twice about. I have done it myself years ago.
It is very easy to think you are invincible when you are pissed. Waking up the next morning, how many women are there who dont report what has happened to them to the police, because of the stigma of not being belived, or someone saying they asked for it. Of course they didnt bloody ask for it, but if they hadnt been blind drunk, they would possibly have thought twice about going off with a bloke who they did not know.