No arguments needed to put blame here and there. It was the most serious crime possible, rape and murder. The rapist definetely intended her to drown and that was ensured by drugging and leaving her on the beach. Drowning is used to avoid calling it murder. Even if mother was careless does not justify murder. By the way, after a female is under influence of alcohol or drugs, her consent also is considerd invalid as anyways she is not conscious. A drug addict deserves treatment. Not rape and murder. A murder is a murder. NO ARGUMENTS. Let the courts decide.
