Maybe, if we have money and time management, self-control, self-discipline, knows the chances of winning and losing, recognizes gambling as fun and knows how to stop, Gambling will be harmless and will not be labelled as threat.
Definitely because it's up to the gambler on how they will handle themselves, there are responsible but we can't deny that there are also people who can't learn from their mistakes and they don't know they are already destroying their life because of gambling.
However, we can't blame gambling for that, we need to blame the gambler.
Just like a criminal kill someone with a gun, we don't blame the gun but the criminal.