Try comparing Netherlands to nearby European countries with similar demograohics. The Dutch had much lower crime rates before legalizing drugs.
2 January 2008
AMSTERDAM -- 147 murders were committed in the Netherlands last year, one fewer than in 2006 and therefore a record low, according to the annual report from Elsevier.
http://www.expatica.com/nl/news/local_news/Record-low-murder-rate-once-again.html