People should be held accountable for their own actions. Just as you said the 16-yr-old murderer's actions shouldn't be blamed on someone else, neither should a victim be blamed for a rapist's actions.
Here are some references about the underdeveloped teenage brain. I share this to demonstrate that teen girls wearing provocative clothing are not doing so to "invite trouble" because they are not physically capable of linking consequences to actions. The part of the brain responsible for linking consequences has not yet developed at their age. They are simply wearing clothing like that because 1) they like it, 2) it's popular, and 3) it gets them attention. They cannot be held accountable for someone else perverting that attention into a rape!
“ We often expect children to think like adults when they are not yet capable of doing so.” http://www.childdevelopmentinfo.com/development/piaget.shtml
“ while teens have as many brain cells as adults, the pre-frontal lobe (the part of the brain that monitors and controls the "primitive" lower brain which is in charge of emotions) of many males does not fully develop until the middle twenties.” http://maxweber.hunter.cuny.edu/pub/eres/EDSPC715_MCINTYRE/BulletProof.html
“researchers have found that the brain continues developing until about age 25! The teenage brain is developing from the back to the front, from the “old brain” where basic life functions and survival are paramount, to the prefrontal cortex wherein lies our ability to think rationally, organize thoughts, weigh consequences, assume responsibility and interpret emotions. Therefore, our teenagers, to varying degrees, will struggle with the adult behaviors we are asking of them. As a normal part of their development, they will seek thrills, thrive on peer acceptance, and have more difficulty dealing with and recovering from stress than adults do. They find it a biological struggle to “shut down” at night to go to sleep and then troublesome to wake up in the morning. They need more sleep than they have since they were babies or will need as adults. They are driven to feel new sensations while they are unable to cognitively make good decisions about how to regulate those drives. They struggle with delayed gratification and they have difficulty predicting far reaching consequences of their behavior. Teens often lack emotional insight and misread the emotional cues of others. All the while, many adults are treating them as if they were adults.” http://www.familiesonthego.org/Parenting_Tips/Articles/PT0003.htm