What is there to understand ? Person with addictive personality decides to do something that is known to be addictive, person gets addicted, then other persons enable that person by telling them it's not their fault they chose to do addictive things so that person doesn't really make any effort to not be addicted, why would they ? it's not their fault, totally out of their control
If you don't understand it, it's perfectly fine to admit it, nobody will think less of you.
What you've just done here however is made it very obvious that you're completely unaware of how addiction works, in a thread about an addictive activity.
Not off to the best start then.