because, friend, while we are free to punish ourselves in any way we see fit, we are not free to injure others through our actions.
You totally missed the meaning of that quote. You may wish to go to your profile page and re-read it slowly.
“The free man owns himself.” No one else or the government owns a free man. He is free to damage himself, if he so chooses. If he chooses to damage himself, he is a fool and possibly a damns his soul. But if a man does not have the freedom to damage himself, if so wills, then he is not a free man at all.
True. But at the same time, we shouldn't be responsible for someone else's harm when they knowingly and voluntarily subject themselves to a particular danger.