Something which very important to note, those who have not downloaded the app are not necessarily lazy, stupid, an a-hole or any of the other terms that from time to time get bandied around.
There are some very legitimate concerns around privacy and this app that needed to be answered. We have all seen the fiasco of various other IT failures by the government, so there is some very good questions which need to be asked, and not just by the tin-foil hat brigade.
Whilst IMHO they have been answered I only feel confident in saying that because I have the ability to review technical documentation myself. Not everyone has the ability to review technical documentation / has a trusted person who can.
If you see someone who is on the fence, but has concerns, direct them to the appropriate resources so they can make an informed decision. There has now been a variety of articles written which explains what the app does, and why there isn't an overly heightened privacy risk from the app. Having concerns is a valid thing to do, helping someone overcome those concerns doesn't happen via name calling.