Don't think the same thing won't happen elsewhere
I would suggest that it's reasonable to bet that other governments if they are allowed to put such a "contact tracing system" into place will eventually decide that the data must be used "for the public good" because... (insert whatever crime/sedition is riding a current wave of hysteria).
Probably something about terrorists or think of the children or rebelling against being imprisoned in your homes en mass or such...
Biting the hand that feeds IT
