The simple reason for this is that the causes for any person to have these qualities are completely unrelated to the etiologic neurophysiology that causes addictions. Addiction is a choice and a decision. Addicts choose their addictions and life style. Addicts choose to remain addicted. Relapse is a choice.
Addiction is willful misbehavior.
Some addictions are worse than others. Pedophilia is the worst. Crack and heroin are next. The rest are bad but not as bad. Drugs make people psychotic.