Because it is to the benefit of all addiction, political, and administrative authorities to make sure they survive. Stigma maintains maximal denial and minimal recovery. Although the studies haven't been done, it is probable that the same percentage of addicts have these particular characteristics as the general population. 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.