I understand addiction just fine, addictions can be broken: that is a fact; you can break your body of any such dependency and that you can, means it's your responsibility to do so and thus your fault if you remain addicted. I understand addiction, you don't understand that we don't all then conclude from that that one has no culpability. Other people have different moral reasoning than you do, that they disagree with you about something does not mean it's because they don't understand it.