No gambling is not harmful to the society unless you get actively involved in it. That is where the word responsible gambling comes from.
You much check out this piece to better understand what I am stating (http://www.responsiblegambling.vic.gov.au/awareness-and-prevention/know-the-odds)

Now you might be screaming by saying I am a sock puppet of Crypto-Games but let me make you clear, I joined there from my own will and not from other's advice.