1. The most common scenario of regretting to donate is family opposition. The general plot is that the donor agrees to donate, but has been determined to donate when the parents firmly opposed, and then lead to the final can not donate. Most of the volunteers of the Bone Marrow Bank are young people, many of them are still students, and cannot be financially independent. And our generation has a high percentage of only children, and our fathers are of the square dancing generation. I'm not saying that square dancing is wrong, but it's a bit difficult to ask people who can't even do the "don't cause trouble" thing to do something that will harm themselves and benefit others. As for the younger generation, because they are not financially independent, their will is not free. Major decisions are usually interfered by their parents. This has nothing to do with morality. Even major life events such as schooling, employment and marriage are subject to serious parental interference, not to mention things like donations.
2. Medical personnel and staff of bone marrow banks and the Red Cross emphasize that donation is completely harmless, which is a lie with open eyes. The fact that there are deaths in bone marrow donation, even if the probability is low, is a fact of life and cannot be denied. One-sidedly emphasize the safety and avoid talking about the risk, there is a suspicion of fraud.