It's just because people are blind when they saw the profits and the fun in gambling and forget how dangerous gambling can be with them.
Maybe we are not blind, we see the risk and we know that we are losing most of the time but the fun is what we are looking, the thing that we should master is on how to manage the risk because we know we will still gonna end up losing in the end. Addiction should be something to be avoided and with self discipline we will be able to do that, let's be careful all the time and always stay in control so we will not be addicted.