I haven't read the whole thread because in truth these threads always go the same way.
The reality is that the "if you don't allow your organs to be donated you are uneducated/you clearly don't know what you're talking about/if you don't donate your organs then you should be prepared for your children to die," mob are no more educated than those they seek to judge.
Opt out means nothing other than that in the event of your death your family will get to make the decision with regard to your body and what happens to it, in the same way that even carrying a donor card now is meaningless other than that the medics are aware you are on the register but your family still have the overriding decision and can still decide to refuse for your organs to be donated, even if you have expressed a wish for them to be.
In reality we don't need an opt out system, we need a system where people speak to their families before they are in the position to express their wishes in the event of their untimely death. Your family can only give their informed consent if they already know your wishes in advance, and as much as someone may consider it wrong for a family to override your wish to be an organ donor if you haven't had that conversation with them previously, it is equally wrong for a family to decide to donate your organs if you have decided you don't wish for this to happen but hadn't communicated it to them previously.
People often uphold Spain as an example of a country where organ donation has increased after opt out was introduced, but this is actually not true, as what happened was that an education programme was launched at the same time to talk to people about how to speak to their families about their wishes, while organ donor coordinators were also taken through a programme to ensure the most sensitive way to speak to the families of potential donors. Evidence is actually more prevalent that when opt out is introduced on the whole, donor rates decrease signifficantly.
I am surprised that a website like MN where people talk about consent on a regular basis, those same people feel that all bodily autonomy and ability to consent should be lost at the point of death. Do you really think that it is beneficial for your body to become the property of the state when you die? Or perhaps you would rather that your family, the ones who know you best, who would know your thoughts and wishes, be the ones to make the final decisions as to what happens to your body if you die?
I have no qualms about my organs being donated in the event of my death. There are organs of mine which would not be suitable given my current health, however I may have something which someone would benefit from, and as I'll be dead they won't be of much use to me.
However I refuse to allow my body to become the property of the state, and as such I have already had the conversation with my family with regards to my wishes, wishes which I know they will uphold in the event I am not around. So I know that if I die my family will uphold my wishes, and as such, if opt-out were introduced I will be opting out, safe in the knowledge that I have had a conversation with those who are best placed to make the decisions I will not be in a position to make for myself.