So is sex, sugar, caffine and chocolate, what's your point...
Sugar, caffeine, and chocolate may be addictive to some people, but those addictions don't lead to sex crimes and murder. Go to a search engine and type in 'porn addiction", and you'll discover just how addictive it is. Here's just one of many sites:
http://www.family.org/lote/lotelive/articles/a0011900.cfm
Do a little more research and discover for yourself that almost every serial killer was a porn addict actualizing his porn induced fantasies.
Porn as "freedom of speech" is a corruption of the term. There is liberty and then there is 'license'. Porn is the latter, not the former.