Although risking getting too far off topic - Hitler did do good things, but it doesn't justify the millions he murdered so do not get that confused. Among some of his contributions are:
1) Animal conservation acts and the banning of vivisection,
2) Anti-tobacco laws as well as the link of smoking and lung cancer (further touched upon later) as well as it being forbidden for pregnant women to smoke as well as the banning of advertisements and smoking on public transport, restaurants, etc,
3) A push to have every German citizen with a mode of transport (car) which resulted in Volkswagen,
4) Unification of Germany and bringing it back from a severe depression with huge economic troubles and high unemployment rates including repaying all foreign debts. This also included a very large welfare system with the belief that every person should have the same standard of living,
5) The creation of the modern highway system (Autobahn) which allows people to commute quickly and efficiently, among other infrastructure,
6) Similar to above, he invented a schedule system for rail as well as a standardised unit of measure,
7) The ceremonial lightning of the flame in the Olympics was Hitler's idea, a tradition we still follow to this day,
8) Creation of a kindergarten system, a strong belief in uniform and fashion as well as innovations in film, art and media (I grouped these together because I want to have 10 points),
9) Incredible advances in technology, mainly in the area of jet and rocket propulsions, so much so that their research into it was top secret and classified as 'war decisive' and far ahead beyond every other country which is confirmed by experts and was later used to fly man to the moon (it was so good and advanced that it was essentially unchanged when used in 1969) and
10) Medical findings, albeit at a total disregard for ethics, from many experiments that would otherwise be impossible today for the aforementioned reason; these findings dramatically improved our modern understanding of the human body and anatomy as well as ways to treat them such as the development of Methadone.
Premeditated murder is the act of killing someone when you have thought about it previously such as including, but not limited to, method, timing, likeliness of success, hiding evidence and evading detection. A person's act to drink alcohol is most often premeditated but it is stupid, for lack of a better world, to assume that always results in premeditated murder while driving under the influence.