To answer this, no they are not perfectly rational. However they are not dumb, anyone can be a rapist, it is a mental disorder which doesn’t correlate with their IQ.
The ‘tons of reasons’ statement would be interesting to read about, as usually a perpetrators focus is rape and escape. Not befriending the victim - i might suggest how inconsistent this sounds.
Unless the victim has other mental problems then this could occur. However, I was simply seeking an answer, not an explosive statement.
Different kinds of alcohol is just different flavours of hand sanitiser.