It's because they bever be in such situations that involved molestation and harrasment including life threatening to the point of death, somethings happens and we take a wrong decision as approach to administering the situation because we are not the one or victim involved, self defence is legal and under the court of law it's is allowed in constitution, but there must be a tangible evidence to ascertain the situation under a murder or life threatening self defense, because somethings were better experienced or witnessed than making a wrong judgement on the whole situation, engage in self defense to get yourself secured from any things that serves danger to your life.