I'll start off with a disclaimer: I am currently registered as a non-donor via the 'opt out' system. I am currently not offering up my healthy organs for a transplant. That said, I still want to point out my opinion as to why 'opt out' is better than 'opt in' for the general population. Before calling me a hypocrite for having two conflicting stances; be aware that my medical history and record are not public to Reddit or anywhere. Everyone's reason to opt out can be different and not all these reasons are equally simple.

The state doesn't own your body (in that fashion). When you are dead beyond recovery, your healthy organs won't do you any good. There is, however, bound to be someone in your direct vicinity who desperately needs a transplant to avoid their own death beyond recovery. If you were to die from a brain aneurysm, but you're otherwise in perfect health, there is an important choice that should be made. Between disregarding your functioning parts and helping someone else survive, many countries are starting to believe it is better to change 'opt in' into 'opt out' to increase the chances of successful organ transplants and in turn saving lives. After all, your time to make a choice is gone when you're dead.

And that's exactly what the 'opt out' is for; the general rule is that you can actively choose and change your stance on organ donation, so if you actively object you'll be changing it. But if you're indifferent enough, you won't. You can't die forever and then change your mind about donation afterwards. It's your body and your choice, but it should be your responsibility to make that choice well before death.

If you required an organ transplant immediately and one compatible individual dies under the 'opt in' rule and they didn't opt in, you might also die because their organs are not up for transplantation.

If that same individual dies under the 'opt out' rule and they didn't opt out, you may very well live.

The main problem with the 'opt in' system is that most people forget to opt in or don't even realise this is a thing they can even choose. It is reasonable to believe that more organs than necessary have gone unused even if the person might have had no issue with their organs going to others.

An 'opt in' rule changes that and that's very important.