I will try to give a brief answer because I know that time is short.
Polarization is a multiplayer game. Responsibility for the current polarization is shared among a number of players. For example, the media are partly responsible.
A prudent politician, in the classic sense of the term, must be able to read the temperature of the room, in terms of polarization, in order to gauge how to communicate with the general public.
We are living in a time when the media are always on the hunt for missteps to increase polarization or draw attention. It may be a regrettable situation, but it is what it is.
I don't want to say that such and such a person is fully responsible for polarization, but it seems to me that elected officials should take action to reduce polarization. I'm not pointing fingers, but I feel that throwing oil on the fire simply creates scandals where none exist.
I agree with you that, in this particular case, it is highly likely that the data use is perfectly harmless. However, hiding things and overlooking the Privacy Commissioner makes it look as though something is something off, which has a tendency to fuel polarization rather than reduce it. That's unfortunate, in the current context.