I'm sorry, but your appeal to morality is a fallacy, and thus a bullshit argument. I, and everyone I know who has gone to one, has enjoyed our trips to Vegas and Atlantic City. We've played moderately, and see it as entertainment. Now, if you have evidence/empirical data that shows that gambling causes more misery than joy, by all means, present it!

Alcohol is not bad because some small percentage of people get addicted. Neither is online gaming, neither is sex, neither is marijuana, neither is gambling.

Now, nicotine... THERE you might have an argument. But even that is fraught with difficulty: http://discovermagazine.com/2014/march/13-nicotine-fix