Please identify one feminist, anywhere on the Internet or in books, who claims that non-consensual pregnancy and subsequent child support cannot ruin a man's life.
Hell, identify one feminist who thinks that man in your hypothetical wasn't raped.
This ain't feminists disadvantaging men. It's the patriarchy harming everyone. Being "weaker"/female means you get raped more often. Being "stronger"/male means that when something painful and traumatic happens to you, nobody cares. See how everybody loses, and then you and I have to dispute whether this is a zero-sum game to begin with?
Anyway, your last question--most crimes, including rape, in most states, have an intent element. Most states also don't let you get wasted and say, "Hey, I was blind drunk, I didn't intend to rape zir!" They say, "You intended to get drunk. We charge you with the consequences." It's crude but effective, for example, in cases where a drunk driver kills a car full of teenagers.
I'm a lawyer but not your lawyer. Your state probably has weird rules and exceptions to this, just like every other state.