We have lots of knowledgeable IT folk saying how they know how these things work and they are opting out because do data is safe. I'm an IT
mug and 'knowing' that the data isn't safe and may be breached is my starting point!
So then I weigh the risk of data beach against the benefits to me of the system (a frequent traveller away from my GP area and with a few medial issues as I get 'on') AND I assess if my data is hacked, would it actually matter to me? For me, I come out on participating but I know for others the equation is different.
But I think you need to actually do the risk/benefit analysis rather than just say 'data isn't safe - I'm out'.