She was only just 21. Hardly full of worldly wisdom and experience of drinking. It's possible she'd never been that drunk before. We've nearly all been there. She went out to have fun which she is entitled to do. She drank too much.
She did not get behind the wheel of a car. I doubt she ever would in that condition because she's of the generation that's been brought up not to drink and drive. She didn't go near water. She did not endanger anyone.
Her behaviour WAS discouraged- she was refused entry to a club she wanted to go to. She'd spent time getting ready to go to. Was looking forward to. If she hadn't come across some psychopath she'd have been further discouraged by a massive hangover
PR managed to drive around without attracting the attention of the police so we can assume he was NOT drunk. If he is guilty, and that is for the court to decide, he has caused considerably and deliberate harm to her, her family and her friends.
She was vulnerable because he, if guilty, was out prowling. She'd have been just as vulnerable if she'd been lying in her bed sober and he'd broken in. Or soberly walking back from the chip shop or library or any quiet dimly lit area. It was the person she came across that made her vulnerable. So do all females stop living because of the tiny minority of rapists and murderers?
The harm caused was deliberately caused. The person that caused it unlikely to be drunk. Even the lowest most selfish drunk driver doesn't set out to harm.