Prohibition Is Arbitrary
Anything that people enjoy can be done to excess, and gambling does not seem any harder to resist than other pleasurable activities that remain perfectly legal. According to a survey reported in the October 2006 American Journal of Psychiatry, about 6 percent of shoppers experience “compulsive buying.” Data from the federal government indicate that the rate of alcohol abuse or dependence among past-year drinkers is something like 13 percent. By comparison, a 2007 government-sponsored survey in the U.K. found that the prevalence of “problem gambling” among people who had placed bets in the previous year was 1.3 percent. In a 2007 study sponsored by the Austrian gambling business bwin.com and reported in the Journal of Gambling Studies, researchers at Harvard Medical School examined the gambling patterns of more than 40,000 online sports bettors for eight months and found that less than 1 percent qualified as “heavily involved bettors” with large losses.
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"This argument suggests because humans have some addictive tendencies, gambling promoters should be unleashed to they can addict all possible victims"
You're forgetting one important thing here. Who is the "victim?" People choose to gamble, no one forces them to do so. Gambling inherently involves risk, as do so many other things in life. The same goes with alcohol and cigarettes - they are advertised and those ads paint them as fun, great things to do. Still, many people know enough not to drink or smoke, as there are risks!
It comes down to choice and personal responsibility. If you are going to gamble, drink or smoke, or whatever, no one is going to hold a gun to your head and make you do so. Criminalize gambling, however, and you'll quickly find people putting guns to peoples' heads in order to force them not to gamble! It's the old "if you can't save yourself from yourself, I'll do whatever it takes to save you from yourself, even if my doing so hurts you worse than the behavior you originally engaged in." Unfortunately, that's the mindset of many do-gooder Americans. And look at the problems they've wrought.
You ask who's the "victim". People who are not involved in gambling become the victims, victims of increased crime , of having their taxes diverted to entitlement programs because of poverty , etc. etc. I could apply your logic to another risky but entertaining activity, driving drunk. Do you think drunk driving should be legal , or does " freedom " have its limits?