I don’t run out into a busy freeway either, as this silly girl essentially did.
....... way over your head. If you need me to say it at your level, let me know, I’ll give it a try.
Explain how gang rapists are like cars lawfully driving on a freeway.
It's more like this: the girl willingly went to a party, and stayed.
She was drinking, obviously there were other drinkers at the party, and while the story doesn't say, it's reasonable to assume that she wasn't drinking alone, and that at least some of the others were drunk also.
She willingly continued to drink until she passed out drunk, thereby leaving the safty and well being of her person in the control of anyone/everyone/no-one else at the party.
A reasonably intelligent person can easily connect her willingness to leave her personal safety in the hands of others who are not able to stop on a dime (the other drunks) to running out onto a busy freeway where the drivers are also not able to stop on a dime.