you clearly don't understand how murder rates are calculated. I hoped you were joking, but you seem to be serious.
The murder rate is calculated by dividing the number of murders by the population of a jurisdiction and multiplying the result by 100,000. The result is then expressed as the number of murders per 100,000 people.
Murder rates are often used to compare states and countries, as they can be more useful than the absolute number of murders committed.
Crime rates are calculated based on the number of crimes per 100,000 people.
More people doesn't mean a higher murder rate. You are out of it.