The problem with advising against drinking is that if a girl does drink then gets raped, she might feel it was her fault, maybe not even dare say what has happened to her even though it is never can possibly be her fault.
Shots etc are so strong someone could get very drunk without meaning to as well, especially if they were inexperienced, had been ill, had not eaten enough etc.
In so many cases, even when alcohol was not involved she will blame herself anyway.
When I was young my friends and I were often quite wildly drunk for fun, in circles where there were a lot of males who were a bit older (perfectly sought after and attractive) and none of them ever, ever took advantage of us to even to try to get [drunken]'consent' sex in the first place, let alone push-you-down-and-get on-with-it-sex/rape that the girl will later be made to feel responsible for. I realise we must have been truly lucky, that terrible things would have been happening to some other girls, but the point is there are decent men, who would not take advantage of someone's vulnerability, and some very nasty ones who set out to do just that.
Pragmatically, I think that some unpleasant men think that when a girl or woman is drunk or drugged, she will be more likely to want sex or will be easier to get sex with. Any fun = sex. This seems often to be true in practice and the girl would genuinely say it was consensual, even if she regretted it, or felt used later.
Rape is relatively easy in this situation. A woman might even say it was consensual when it wasn't because of blaming herself for drinking, or being fuzzy in memory. Unpleasant men like to buy girls lots of drinks for that reason and rapists are just plying the drinks/drugs to make raping even easier for themselves. Often the rapists probably do not even see it as rape but just normal sex.
The rapists see a girl is drunk they target her as vulnerable prey and conveniently manipulate the situation to separate her. They conveniently see consent in everything she does from then on, whether it is really there or not. A great proportion of rapes are alcohol related no doubt just because they are really comparatively easy to do.
A large proportion of rapes though are also with anyone with a diminished capacity to consent, guard boundaries or control the situation: the disabled, the old, the mentally ill, children, babies the down trodden, the formerly abused in childhood.